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Pro Tools
Digital audio workstation

Pro Tools is a digital audio workstation (DAW) developed and released by Avid Technology (formerly Digidesign) for Microsoft Windows and macOS. It is used for music creation and production, sound for picture (sound design, audio post-production and mixing) and, more generally, sound recording, editing, and mastering processes.

Pro Tools operates both as standalone software and in conjunction with a range of external analog-to-digital converters and PCIe cards with on-board digital signal processors (DSP). The DSP is used to provide additional processing power to the host computer for processing real-time effects, such as reverb, equalization, and compression and to obtain lower latency audio performance. Like all digital audio workstation software, Pro Tools can perform the functions of a multitrack tape recorder and a mixing console along with additional features that can only be performed in the digital domain, such as non-linear and non-destructive editing (most of audio handling is done without overwriting the source files), track compositing with multiple playlists, time compression and expansion, pitch shifting, and faster-than-real-time mixdown.

Audio, MIDI, and video tracks are graphically represented on a timeline. Audio effects, virtual instruments, and hardware emulators—such as microphone preamps or guitar amplifiers—can be added, adjusted, and processed in real-time in a virtual mixer. 16-bit, 24-bit, and 32-bit float audio bit depths at sample rates up to 192 kHz are supported. Pro Tools supports mixed bit depths and audio formats in a session: BWF/WAV (including WAVE Extensible, RF64 and BW64) and AIFF. It imports and exports MOV video files and ADM BWF files (audio files with Dolby Atmos metadata); it also imports MXF, ACID and REX files and the lossy formats MP3, AAC, M4A, and audio from video files (MOV, MP4, M4V). The legacy SDII format was dropped with Pro Tools 10, although SDII conversion is still possible on macOS.

Pro Tools has incorporated video editing capabilities, so users can import and manipulate high-definition video file formats such as XDCAM, MJPG-A, PhotoJPG, DV25, QuickTime, and more. It features time code, tempo maps, elastic audio, and automation; supports mixing in surround sound, Dolby Atmos and VR sound using Ambisonics.

The Pro Tools TDM mix engine, supported until 2011 with version 10, employed 24-bit fixed-point arithmetic for plug-in processing and 48-bit for mixing. Current HDX hardware systems, HD Native and native systems use 32-bit floating-point resolution for plug-ins and 64-bit floating-point summing. The software and the audio engine were adapted to 64-bit architecture from version 11.

In 2022, Avid switched Pro Tools from a perpetual license to a subscription model. New users have to choose between three new plans: Pro Tools Artist, which costs $9.99 per month or $99 per year; Pro Tools Studio, which costs $39.99 per month or $299 per year; and Pro Tools Flex, which costs $99.99 per month or $999 per year. Later in 2022, Avid launched a free version: Pro Tools Intro.

In 2004, Pro Tools was inducted into the TECnology Hall of Fame, an honor given to "products and innovations that have had an enduring impact on the development of audio technology."

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History

Pro Tools milestones
1985Sound Designer
1986
1987Sound Designer Universal (1.5)
1988
1989Sound Tools
Sound Designer II
1990
1991Pro Tools
1992Sound Tools II
1993Pro Tools II
1994Pro Tools TDM
Pro Tools III
1995
1996Pro Tools PCI
1997Pro Tools 4
Pro Tools | 24
1998Pro Tools | 24 MIX
1999Pro Tools 5
Pro Tools LE
2000
2001Pro Tools Free
2002Pro Tools | HD
2003Pro Tools 6
2004
2005Pro Tools 7
2006
2007
2008Pro Tools 8
2009
2010Pro Tools 9
2011Pro Tools | HDX
Pro Tools 10
2012
2013Pro Tools 11
2014
2015Pro Tools 12
Pro Tools | First
2016
2017
2018Pro Tools 2018+

The beginnings: Digidrums (1983–1985)

Pro Tools was developed by UC Berkeley graduates Evan Brooks, who majored in electrical engineering and computer science, and Peter Gotcher.19

In 1983, the two friends, sharing an interest in music and electronic and software engineering, decided to study the memory mapping of the newly released E-mu Drumulator drum machine to create EPROM sound replacement chips. The Drumulator was quite popular at that time, although it was limited to its built-in samples.20

They started selling the upgrade chips one year later under their new Digidrums label.21 Five different upgrade chips were available, offering different alternate drum styles. The chips, easily switchable with the original ones, enjoyed remarkable success between the Drumulator users, selling 60,000 units overall.22

Digidesign Sound Designer (1985–1989)

When Apple released its first Macintosh computer in 1984, the pair thought to design a more functional and flexible solution which could take advantage of a graphical interface.23 In collaboration with E-Mu, they developed a Mac-based visual sample editing system for the Emulator II keyboard, called Sound Designer, released under the Digidesign brand24 and inspired by the interface of the Fairlight CMI.25 This system, the first ancestor of Pro Tools, was released in 1985 at the price of US$995.26

Brooks and Gotcher rapidly ported Sound Designer to many other sampling keyboards, such as E-mu Emax, Akai S900, Sequential Prophet 2000, Korg DSS-1, and Ensoniq Mirage.27 Thanks to the universal file specification subsequently developed by Brooks with version 1.5,28 Sound Designer files could be transferred via MIDI between sampling keyboards of different manufacturers.29 This universal file specification, along with the printed source code to a 68000 assembly language interrupt-driven MIDI driver, was distributed through Macintosh MIDI interface manufacturer Assimilation, which manufactured the first MIDI interface for the Mac in 1985.

Starting from the same year, a dial-up service provided by Beaverton Digital Systems, called MacMusic, allowed Sound Designer users to download and install the entire Emulator II sound library to other less expensive samplers: sample libraries could be shared across different manufacturers platforms without copyright infringement. MacMusic contributed to Sound Designer's success by leveraging both the universal file format and developing the first online sample file download site globally, many years before the World Wide Web use soared. The service used 2400-baud modems and 100 MB of disk space with Red Ryder host on a 1 MB Macintosh Plus.30

With the release of Apple Macintosh II in 1987, which provided card slots, a hard disk, and more capable memory, Brooks and Gotcher saw the possibility to evolve Sound Designer into a featured digital audio workstation. They discussed with E-mu the opportunity of using the Emulator III as a platform for their updated software, but E-mu rejected this offer. Therefore, they decided to design both the software and the hardware autonomously. Motorola, which was working on its 56K series of digital signal processors, invited the two to participate in its development. Brooks designed a circuit board for the processor, then developed the software to make it work with Sound Designer. A beta version of the DSP was ready by December 1988.31

Digidesign Sound Tools and Sound Designer II software (1989–1990)

The combination of the hardware and the software was called Sound Tools. Advertised as the "first tapeless studio",32 it was presented on January 20, 1989, at the NAMM International Music & Sound Expo. The system relied on a NuBus card called Sound Accelerator, equipped with one Motorola 56001 processor. The card provided 16-bit playback and 44.1/48 kHz recording through a two-channel A/D converter (AD In), while the DSP handled signal processing, which included a ten-band graphic equalizer, a parametric equalizer, time stretching with pitch preservation, fade-in/fade-out envelopes, and crossfades ("merging") between two sound files.3334

Sound Tools was bundled with Sound Designer II software, which was, at this time, a simple mono or stereo audio editor running on Mac SE or Mac II; digital audio acquisition from DAT was also possible.35 A two-channel digital interface (DAT-I/O) with AES/EBU and S/PDIF connections was made available later in 1989, while the Pro I/O interface came out in 1990 with 18-bit converters.36

The file format used by Sound Designer II (SDII) became eventually a standard for digital audio file exchange until the WAV file format took over a decade later. Since audio streaming and non-destructive editing were performed on hard drives, the software was still limited by their performance; densely edited tracks could cause glitches.37 However, the rapidly evolving computer technology allowed developments towards a multi-track sequencer.

Deck, Pro Tools, Sound Tools II and Pro Tools II (1990–1994)

The core engine and much of the user interface of the first iteration of Pro Tools was based on Deck. The software, published in 1990, was the first multi-track digital recorder based on a personal computer. It was developed by OSC, a small San Francisco company founded the same year, in conjunction with Digidesign and ran on Digidesign's hardware.38 Deck could run four audio tracks with automation; MIDI sequencing was possible during playback and record, and one effect combination could be assigned to each audio track (2-band parametric equalizer, 1-band EQ with delay, 1-band EQ with chorus, delay with chorus).39

The first Pro Tools system was launched on June 5, 1991. It was based on an adapted version of Deck (ProDeck) along with Digidesign's new editing software, ProEdit, created by Mark Jeffery;40 Sound Designer II was still supplied for two-channel editing.41 Pro Tools relied on Digidesign's Audiomedia card, mounting one Motorola 56001 processor42 with a clock rate of 22.58 MHz43 and offering two analog and two digital channels of I/O, and on the Sound Accelerator card. External synchronization with audio and video tape machines was possible with SMPTE timecode and the Video Slave drivers.44 The complete system was selling for US$6,000.45

Sound Tools II was launched in 1992 with a new DSP card. Two interfaces were also released: Pro Master 20, providing 20-bit A/D conversion,46 and Audiomedia II, with improved digital converters and one Motorola 56001 processor running at 33.86 MHz.47

In 1993, Josh Rosen, Mats Myrberg and John Dalton, the OSC's engineers who developed Deck, split from Digidesign to focus on releasing lower-cost multi-track software that would run on computers with no additional hardware. This software was known as Session (for stereo-only audio cards) and Session 8 (for multichannel audio interfaces) and was selling for US$399.4849

Peter Gotcher felt that the software needed a significant rewrite. Pro Tools II, the first software release fully developed by Digidesign, followed in the same year and addressed its predecessor's weaknesses.50 The editor and the mixer were merged into a single Pro Tools application that utilized the Digidesign Audio Engine (DAE) created by Peter Richert. DAE was also provided as a separate application to favor hardware support from third-party developers, enabling the use of Pro Tools hardware and plug-ins on other DAWs. 5152 Selling more than 8,000 systems worldwide, Pro Tools II became the best-selling digital audio workstation.53

Pro Tools II TDM: 16 tracks and real-time plug-ins (1994)

In 1994, Pro Tools 2.5 implemented Digidesign's newly developed time-division multiplexing technology, which allowed routing of multiple digital audio streams between DSP cards. With TDM, up to four NuBus cards could be linked, obtaining a 16-track system, while multiple DSP-based plug-ins could be run simultaneously and in real-time.54 The wider bandwidth required to run the larger number of tracks was achieved with a SCSI expansion card developed by Grey Matter Response, called System Accelerator.55

In the same year, Digidesign announced that it merged into the American multimedia company Avid,56 developer of the digital video editing platform Media Composer and one of Digidesign's major customers (25% of Sound Accelerator and Audiomedia cards produced was being bought by Avid). The operation was finalized in 1995.57

Pro Tools III: 48 tracks, DSP Farm cards and switch to PCI cards (1995–1997)

With a redesigned Disk I/O card, Pro Tools III was able to provide 16 tracks with a single NuBus card;58 the system could be expanded using TDM to up to three Disk I/O cards, achieving 48 tracks.59 DSP Farm cards were introduced to increase the processing power needed for a more extensive real-time audio processing; each card was equipped with three Motorola 56001 chips running at 40 MHz.60 Multiple DSP cards could be added for additional processing power; each card could handle the playback of 16 tracks.61 A dedicated SCSI card was still required to provide the required bandwidth to support multiple-card systems.62

Along with Pro Tools III, Digidesign launched the 888 interface, with eight channels of analog and digital I/O, and the cheaper 882 interface.63 The Session 8 system included a control surface with eight faders.64 A series of TDM plug-ins were bundled with the software, including dynamics processing, EQ, delay, modulation, and reverb.65

In 1996, following Apple's decision to drop NuBus in favor of PCI bus, Digidesign added PCI support with Pro Tools 3.21. The PCI version of the Disk I/O card incorporated a high-speed SCSI along with DSP chips,66 while the upgraded DSP Farm PCI card included four Motorola 56002 chips running at 66 MHz.67

This change of architecture allowed the convergence of Macintosh computers with Intel-based PCs, for which PCI had become the standard internal communication bus.68 With the PCI version of Digidesign's Audiomedia card in 1997 (Audiomedia III),69 Sound Tools and Pro Tools could be run on Windows platforms for the first time.70

24-bit audio and surround mixing: Pro Tools | 24 and Pro Tools | 24 MIX (1997–2002)

With the release of Pro Tools | 24 in 1997, Digidesign introduced a new 24-bit interface (the 888|24) and a new PCI card (the d24). The d24 relied on Motorola 56301 processors, offering increased processing power and 24 tracks of 24-bit audio71 (later increased to 32 tracks with a DAE software update). A SCSI accelerator was required to keep up with the increased data throughput. Digidesign dropped its proprietary SCSI controller in favor of commercially available ones.72

64 tracks with dual d24 support were introduced with Pro Tools 4.1.1 in 1998,73 while the updated Pro Tools | 24 MIX system provided three times more DSP power with the MIX Core DSP cards. MIXplus systems combined a MIX Core with a MIX Farm, obtaining a performance increase of 700% compared to a Pro Tools | 24 system.74

Pro Tools 5 saw two substantial software developments: extended MIDI functionality and integration in 1999 (an editable piano-roll view in the editor; MIDI automation, quantize and transpose)75 and the introduction of surround sound mixing and multichannel plug-ins—up to the 7.1 format—with Pro Tools TDM 5.176 in 2001.77

The migration from traditional, tape-based analog studio technology to the Pro Tools platform took place within the industry:78 Ricky Martin's "Livin' la Vida Loca" (1999) was the first Billboard Hot 100 number-one single to be recorded, edited, and mixed entirely within the Pro Tools environment,79 allowing a more meticulous and effortless editing workflow (especially on vocals).80

While consolidating its presence in professional studios, Digidesign began to target the mid-range consumer market in 1999 by introducing the Digi001 bundle, consisting of a rack-mount audio interface with eight inputs and outputs with 24-bit, 44.1/48 kHz capability and MIDI connections. The package was distributed with Pro Tools LE, a specific version of the software without DSP support, limited to 24 mixing tracks.81

High-resolution audio and consolidation of digital recording and mixing: Pro Tools | HD (2002–2011)

Following the launch of Mac OS X operating system in 2001, Digidesign made a substantial redesign of Pro Tools hardware and software. Pro Tools | HD was launched in 2002, replacing the Pro Tools | 24 system and relying on a new range of DSP cards (HD Core and HD Process, replacing MIX Core and MIX Farm), new interfaces running at up to 192 kHz or 96 kHz sample rates (HD 192 and 96, replacing 888 and 882), along with an updated version of the software (Pro Tools 6) with new features and a redesigned GUI, developed for OS X and Windows XP.82 Two HD interfaces could be linked together for increased I/O through a proprietary connection. The base system was selling for US$12,000, while the full system was selling for US$20,000.83

Both HD Core and Process cards mounted nine Motorola 56361 chips running at 100 MHz, each providing 25% more processing power than the Motorola 56301 chips mounted on MIX cards; this translated to about twice the power for a single card. A system could combine one HD Core card with up to two HD Process cards, supporting playback for 96/48/12 tracks at 48/96/192 kHz sample rates (with a single HD Core card installed) and 128/64/24 tracks at 48/96/192 kHz sample rates (with one or two HD Process cards).84

When Apple changed the expansion slot architecture of the Mac G5 to PCI Express, Digidesign launched a line of PCIe DSP cards that both adopted the new card slot format and slightly changed the combination of chips. HD Process cards were replaced with HD Accel, each mounting nine Motorola 56321 chips running at 200 MHz and each providing twice the power than an HD Process card; track count for systems mounting an HD Accel was extended to 192/96/36 tracks at 48/96/192 kHz sample rates.85 The use of PCI Express connection reduced round-trip delay time, while DSP audio processing allowed the use of smaller hardware buffer sizes during recording, assuring stable performance with extremely low latency.86

Pro Tools, offering a solid and reliable alternative to analog recording and mixing, eventually became a standard in professional studios throughout the decade, while editing features such as Beat Detective (introduced with Pro Tools 5.1 in 2001)87 and Elastic Audio (introduced with Pro Tools 7.4 in 2007)88 redefined the workflow adopted in contemporary music production.89

Other software milestones were background tasks processing (such as fade rendering, file conversion or relinking), real-time insertion of TDM plug-ins during playback, and a browser/database environment introduced with Pro Tools 6 in 2003;90 Automatic plug-in Delay Compensation (ADC), introduced with Pro Tools 6.4 in 2004 and only available with TDM systems with HD Accel;91 a new implementation of RTAS with multi-threading support and improved performance, Region groups, Instrument tracks, and real-time MIDI processing, introduced with Pro Tools 7 in 2006;92 VCA and volume trim, introduced with Pro Tools 7.2 in 2006;93 support for ten track inserts, MIDI Editor, and MIDI Score, introduced with Pro Tools 8 in 2009.94

Pro Tools | MIX hardware support was dropped with version 6.4.1.

Native systems: Pro Tools LE and Pro Tools M-Powered

Pro Tools LE, first introduced and distributed in 1999 with the Digi 001 interface,95 was a specific Pro Tools version in which the signal processing entirely relied on the host CPU. The software required a Digidesign interface to run, which acted as a copy-protection mechanism for the software. Mbox was the entry-level range of the available interface; Digi 001 and Digi 002/003, which also provided a control surface, were the upper range. The Eleven Rack also ran on Pro Tools LE, included in-box DSP processing via an FPGA chip, offloading guitar amp/speaker emulation, and guitar effects plug-in processing to the interface, allowing them to run without taxing the host system.

Pro Tools LE shared the same interface of Pro Tools HD but had a smaller track count (24 tracks with Pro Tools 5, extended to 32 tracks with Pro Tools 696 and 48 tracks with Pro Tools 8)97 and supported a maximum sample rate of 96 kHz98 (depending on the interface used). Some advanced software features, such as Automatic Delay Compensation, surround mixing, multi-track Beat Detective, OMF/AAF support, and SMPTE Timecode, were omitted. Some of them, as well as support for 48 tracks/96 voices (extended to 64 tracks/128 voices with Pro Tools 8) and additional plug-ins, were made available through an expansion package called "Music Production Toolkit".99 The "Complete Production Toolkit", introduced with Pro Tools 8, added support for surround mixing and 128 tracks (while the system was still limited to 128 voices).100

With the acquisition of M-Audio in 2004–2005, Digidesign released a specific variant of Pro Tools, called M-Powered, which was equivalent to Pro Tools LE and could be run with M-Audio interfaces.101

The Pro Tools LE/M-Powered line was discontinued with the release of Pro Tools 9.

Hardware-independent native systems: Pro Tools 9

Pro Tools 9, released in November 2010, dropped the requirement of proprietary hardware to run the software. Any audio device could be used through Core Audio on macOS or the ASIO driver on a Windows. Core Audio allowed device aggregation, enabling using of more than one interface simultaneously. Some Pro Tools HD software features, such as automatic plug-in delay compensation, OMF/AAF file import, Timecode ruler, and multi-track Beat Detective, were included in the standard version of Pro Tools 9.102

When operating on a machine containing one or more HD Core, Accel, or Native cards, the software ran as Pro Tools HD with the complete HD feature set. In all other cases, it ran as Pro Tools 9 standard, with a smaller track count and some advanced features turned off.

Advanced Instrument Research (AIR): built-in virtual instruments and plug-ins

In response to Apple's decision to include Emagic's complete line of virtual instruments in Logic Pro in 2004 and following Avid's acquisition of German virtual instruments developer Wizoo in 2005, Pro Tools 8 was supplied with its first built-in virtual instruments library, the AIR Creative Collection, as well as with some new plug-ins, to make it more appealing for music production.103 An expansion was also available, called AIR Complete Collection.

List of AIR Virtual Instruments
AIR Creative Collection
Structure Freesampler with basic library
Boomelectronic drum machine
Vacuumvirtual subtractive-style synthesizer
Mini Grandsampled acoustic piano
DB33sampled Hammond B3 organ
Xpand!2synthesis and sample-based library
AIR Complete Collection
Structuresampler with full library
Strikevirtual drummer
Hybridvirtual subtractive synthesizer
Velvetsampled classic electric pianos
Transfuserreal-time loop manipulation tool

Pro Tools | HDX (2011–present)

In October 2011, Avid introduced Pro Tools 10 and a new series of DSP PCIe cards named HDX. Each card mounted 18 DSP processors, manufactured by Texas Instruments, allowing an increased computational precision (32-bit floating-point resolution for audio processing and 64-bit floating-point summing, versus the previous 24-bit and 48-bit fixed-point resolution of the TDM engine),104 thus improving dynamic range performance. Signal processing could be run on the embedded DSP, providing additional computational power and enabling near zero-latency for DSP-reliant plug-ins. Two FPGA chips handled track playback, monitoring, and internal routing, providing a lower round trip latency.

A second line of PCIe cards, called HD Native, provided low latency with a single FPGA chip but did not mount DSP (audio processing relied on the host system's CPU).105 Round trip latency at 96 kHz was 0.7 ms for HDX and 1.7 ms for HD Native (with a 64-sample buffer).106

To maintain performance consistency, HDX products were specified with a fixed maximum number of voices (each voice representing a monophonic channel). Each HDX card enabled 256 simultaneous voices at 44.1/48 kHz; voice count halved when the sample rate doubled (128 voices at 88.2/96 kHz, 64 voices at 176.4/192 kHz). Up to three HDX cards could be installed on a single system for a maximum of 768/384/192 total voices and for increased processing power. On Native systems, voice count was limited to 96/48/24 voices with the standard version of Pro Tools and 256/128/64 voices with Pro Tools HD software.107

With Pro Tools 10, Avid deployed a new plug-in format for both Native and HDX systems called AAX (an acronym for Avid Audio eXtension).108 AAX Native replaced RTAS plug-ins and AAX DSP, a specific format running on HDX systems, replaced TDM plug-ins. AAX was developed to provide the future implementation of 64-bit plug-ins, although 32-bit versions of AAX were still used in Pro Tools 10. TDM support was dropped with HDX,109 while Pro Tools 10 would be the final release for Pro Tools | HD Process and Accel systems.

Notable software features introduced with Pro Tools 10 were editable clip-based gain automation (Clip gain), the ability to load the session's audio data into RAM to improve transport responsiveness (Disk caching), quadrupled Automatic Delay Compensation length, audio fades processed in real-time, timeline length extended to 24 hours, support for 32-bit float audio and mixed audio formats within the session, and the addition of Avid Channel Strip plug-in (based on Euphonix System 5 console's channel strip, following Avid's acquisition of Euphonix in 2010).110111

Switch to 64-bit architecture (2013)

Pro Tools 11, released in June 2013, switched from 32-bit to 64-bit software architecture with new audio and video engines, enabling the application and plug-ins to fully take advantage of system memory. The new audio engine (AAE) introduced support of offline bouncing and simultaneous mixdowns multiple sources; dynamic plug-in processing allowed to reduce CPU usage when active native plug-ins do not receive any input. Two separate buffers were used for playback and for monitoring of record-enabled or input-monitored tracks. The new video engine (AVE) improved performance and handling of multiple CPU cores.

Support for HD Accel systems, legacy HD interfaces, TDM and 32-bit AAX plug-ins was dropped due to their incompatibility with 64-bit architecture.112 A free starter edition providing the essential features of Pro Tools, called "First", was launched in 2015 and discontinued in December 2021 for being "unviable to continue on a technical level".113

Features

Pro Tools workflow is organized into two main windows: the timeline is shown in the Edit window, while the mixer is shown in the Mix window. MIDI and Score Editor windows provide a dedicated environment to edit MIDI.114 Different window layouts, along with shown and hidden tracks and their width settings, can be stored and recalled from the Window configuration list.115

Timeline

The timeline provides a graphical representation of all types of tracks: the audio envelope or waveform (when zoomed in) for audio tracks, a piano roll showing MIDI notes and controller values for MIDI and Instrument tracks, a sequence of frame thumbnails for video tracks, audio levels for auxiliary, master and VCA master tracks.116 Alternate audio and MIDI content can be recorded, shown, and edited in multiple layers for each track (called playlists), which can be used for track compositing.117 All the mixer parameters (such as track and sends volume, pan, and mute status) and plug-in parameters can be changed over time through automation.118 Any automation type can be shown and edited in multiple lanes for each track.119 Track-based volume automation can be converted to clip-based automation and vice versa;120 automation of any type can also be copied and pasted to any other automation type.121

Time can be measured and displayed on the timeline in different scales: bars and beats, time or SMPTE timecode (with selectable frame rates), audio samples, or film stock feet for audio-for-film referencing (based on the 35 mm film format).122 Tempo and meter changes can also be programmed; both MIDI and audio clips can move or time-stretch to follow tempo changes ("tick-based" tracks) or maintain their absolute position ("sample-based" tracks). Elastic Audio must be enabled to allow time stretching of audio clips.123

Editing

Audio and MIDI clips can be moved, cut, and duplicated non-destructively on the timeline (edits change the clip organization on the timeline, but source files are not overwritten).124 Time stretching (TCE), pitch shifting, equalization, and dynamics processing can be applied to audio clips non-destructively and in real-time with Elastic Audio125 and Clip Effects;126 gain can be adjusted statically or dynamically on individual clips with Clip Gain;127 fade and crossfades can be applied, adjusted and are processed in real-time. All other types of audio processing can be rendered on the timeline with the AudioSuite (non-real-time) version of AAX plug-ins.128 Audio clips can be converted to MIDI data using the Celemony Melodyne engine; pitches with timing and velocities are extracted through melodic, polyphonic, or rhythmic analysis algorithms.129 Pitch and rhythm of audio tracks can also be viewed and manipulated with the bundled Melodyne Essential.

MIDI notes, velocities, and controllers can be edited directly on the timeline, each MIDI track showing an individual piano roll, or in a specific window, where several MIDI and Instrument tracks can be shown together in a single piano roll with color-coding. Multiple MIDI controllers for each track can be viewed and edited on different lanes.130 MIDI tracks can also be shown in musical notation within a score editor.131 MIDI data such as note quantization, duration, transposition, delay, and velocity can also be altered non-destructively and in real-time on a track-per-track basis.132

Video files can be imported to one or more video tracks and organized in multiple playlists. Multiple video files can be edited together and played back in real-time. Video processing is GPU-accelerated and managed by the Avid Video Engine (AVE). Video output from one video track is provided in a separate window or can be viewed full screen.133

Mixing

The virtual mixer shows controls and components of all tracks, including inserts, sends, input and output assignments, automation read/write controls, panning, solo/mute buttons, arm record buttons, the volume fader, the level meter, and the track name. It also can show additional controls for the inserted virtual instrument, mic preamp gain, HEAT settings, and the EQ curve of supported plug-ins.134 Each track inputs and outputs can have different channel depths: mono, stereo, multichannel (LCR, LCRS, Quad, 5.0/5.1, 6.0/6.1, 7.0/7.1); Dolby Atmos and Ambisonics formats are also available for mixing.135

Audio can be routed to and from different outputs and inputs, both physical and internal. Internal routing is achieved using busses and auxiliary tracks; each track can have multiple output assignments.136 Virtual instruments are loaded on Instrument tracks—a specific type of track that receives MIDI data in input and returns audio in output.137

Plug-ins are processed in real-time with dedicated DSP chips (AAX DSP format) or using the host computer's CPU (AAX Native format).138

Track rendering

Audio, auxiliary, and Instrument tracks (or MIDI tracks routed to a virtual instrument plug-in) can be committed to new tracks containing their rendered output. Virtual instruments can be committed to audio to prepare an arrangement project for mixing; track commit is also used to free up system resources during mixing or when the session is shared with systems not having some plug-ins installed. Multiple tracks can be rendered at a time; it is also possible to render a specific timeline selection and define which range of inserts to render.139

Similarly, tracks can be frozen with their output rendered at the end of the plug-in chain or at a specific insert of their chain. Editing is suspended on frozen tracks, but they can subsequently be unfrozen if further adjustments are needed. For example, virtual instruments can be frozen to free up system memory and improve performance while keeping the possibility to unfreeze them to make arrangement changes.140

Mixdown

The main mix of the session—or any internal mix bus or output path—can be bounced to disk in real-time (if hardware inserts from analog hardware are used, or if any audio or MIDI source is monitored live into the session) or offline (faster-than-real-time). The selected source can be mixed to mono, stereo, or any other multichannel format. Multichannel mixdowns can be written as an interleaved audio file or in multiple mono files. Up to 24 sources of up to 10 channels each can be mixed down simultaneously—for example, to deliver audio stems.141

Audio and video can be bounced together to a MOV file; video is transcoded with the DNxHD, DNxHR, Apple ProRes, and H.264 video codecs.142

Session data exchange

Session data can be partially or entirely exchanged with other DAWs or video editing software that support AAF, OMF, or MXF. AAF and OMF sequences embed audio and video files with their metadata; when opened by the destination application, session structure is rebuilt with the original clip placement, edits, and basic track and clip automation.143

Track contents and any of its properties can be selectively exchanged between Pro Tools sessions with Import Session Data (for example, importing audio clips from an external session to a designated track while keeping track settings or importing track inserts while keeping audio clips).144 Similarly, the same track data for any track set—a given processing chain, a collection of clips, or a group of tracks with their assignments—can be stored and recalled as Track Presets.145

Cloud collaboration

Pro Tools projects can be synchronized to the Avid Cloud and shared with other users on a track-by-track basis. Different users can simultaneously work on the project and upload new tracks or any changes to existing tracks (such as audio and MIDI clips, automation, inserted plug-ins, and mixer status) or alterations to the project structure (such as tempo, meter, or key).146

Field recorder workflows

Pro Tools reads embedded metadata in media files to manage multichannel recordings made by field recorders in production sound. All stored metadata (such as scene and take numbers, tape or sound roll name, or production comments) can be accessed in the Workspace browser.147

Analogous audio clips are identified by overlapping longitudinal timecode (LTC) and by one or more user-defined criteria (such as matching file length, file name, or scene and take numbers). An audio segment can be replaced from matching channels (for example, to replace audio from a boom microphone with the audio from a lavalier microphone) while maintaining edits and fades in the timeline, or any matching channels can be added to new tracks.148

Multi-system linking and device synchronization

Up to twelve Pro Tools Ultimate systems with dedicated hardware can be linked together over an Ethernet network—for example, in multi-user mixing environments where different mix components (such as dialog, ADR, effects, and music) reside on different systems, or if a larger track count or processing power is needed. Transport, solo, and mute are controlled by a single system and with a single control surface.149 One system can also be designated for video playback to optimize performance.150 Pro Tools can synchronize to external devices using SMPTE/EBU timecode or MIDI timecode.151

Editions

Pro Tools software is available in three subscription-based paid versions (Artist, Studio and Ultimate) and one free version (Intro).

Before 2022, two different perpetual licenses could be purchased: a standard edition for US$599 (informally called "Vanilla"),152 which provided all the key features for audio mixing and post-production, and a complete edition for US$2599 (officially called "Ultimate" and known as "HD" between 2002 and 2018), which unlocked functionality for advanced workflows and a higher track count.

Pro Tools feature comparison153154155
Subscription/SoftwarePro Tools IntroPro Tools ArtistPro Tools StudioPro Tools Flex/Ultimate
License typeFreePaid (subscription)
Subscription price156–US$9.00/monthUS$31.99/monthUS$99.99/month
Maximum voices, tracks, and hardware inputs
Audio tracks8(mono/stereo)32(mono/stereo)512(mono/stereo/surround)2048(mono/stereo/surround)
Voicesn/a2048 (native/HDX Hybrid)
256/card (HDX classic)
Simultaneous recording inputs41664256/192/64(Native/HDX/HD Native)
MIDI tracks8641024
Instrument tracks832512
Auxiliary tracks/Routing folders4321281024
VCA tracksn/a128
Video tracksn/a164
Aux I/ONoYesYesYes
Bit depth, Sample rate32-bit float, 192 kHz
Production tools
Editing toolsBasicStandardAdvanced
Included pluginsIntro bundle (36)Celemony Melodyne Essential
Artist bundle (100)Complete bundle
MIDI editor/keyboard, Elastic AudioElastic Pitch, Track presets, ARA 2YesYesYesYes
Score editor, Beat Detective,Input monitoring, Clip gainNoYesYesYes
Audio to MIDI conversionNoYesYesYes
Batch Track/Clip rename, Space clipsNoNoYesYes
AVE, Video editing tools,Field recorder workflowsNoNoYesYes(Advanced video editing)
Mixing tools
Multichannel mixingStereoUp to 7.1.2 surround

Dolby Atmos/Ambisonics

AutomationStandardAdvanced
Clip effectsPlayback onlyFull
Plug-in delay compensation,Offline bounce, Track freezeYesYesYesYes
VCA, AFL/PFL solo path,Advanced meteringNoNoYesYes
Dolby Atmos, Ambisonics VR,surround mixing, ADM exportNoNoYesYes
HEATNoYesYesYes
Program features
Cloud collaborationOn inviteYes (includes 1 GB of free storage space)
Session data importingNoYesYesYes
Timecode ruler, AAC codecNoYesYesYes
AAF / OMF / MXF file supportNoNoYesYes
Disk cacheNoNoYesYes
Satellite link(sync up to 12 systems)NoNoYesYes

Control surfaces

In the mid-1990s, Digidesign started working on a studio device that could replace classic analog consoles and provide integration with Pro Tools. ProControl (1998) was the first Digidesign control surface, providing motorized, touch-sensitive faders, an analog control room communication section, and connecting to the host computer via Ethernet. ProControl could be later expanded by adding up to five fader packs, each providing eight additional fader strips and controls.157

Control 24 (2001) added 5.1 monitoring support and included 16 class A preamps designed by Focusrite. Icon D-Control (2004) incorporated an HD Accel system and was developed for larger TV and film productions in mind. Command|8 (2004) and D-Command (2005) were the smaller counterparts of Control 24 and D-Control, connected with the host computer via USB; Venue (2005) was a similar system specifically designed for live sound applications.158

C|24 (2007) was a revision of Control 24 with improved preamps, while Icon D-Control ES (2008) and Icon D-Command ES (2009) were redesigns of Icon D-Control and D-Command.159

In 2010 Avid acquired Euphonix, manufacturer of the Artist Series, and System 5 control surfaces. They were integrated with Pro Tools along with the EuCon protocols. Avid S6 (2013) and Avid S3 (2014) control surfaces followed by merging the Icon and System 5 series. Pro Tools Dock (2015) was an iPad-based control surface running Pro Tools Control software.160

Timeline of Pro Tools hardware and software

This table is incomplete; you can help by expanding it.

YearSoftwareHardwareRelease information
1985Sound DesignerMacintosh-based visual sample editing software developed for the E-Mu Emulator II samplerdedicated ports of the original software were subsequently released for Emax, Prophet 2000, S900, DSS-1, and Mirage samplers161
1987Sound Designer 1.5Sound Acceleratoruniversal version with enhanced editing features through Mac's hardware (mix, crossfade, gain and equalization) and supporting a variety of samplerscompatible with Sound Accelerator NuBus card, equipped with one Motorola 56001 chip, providing dedicated DSP hardware162
1989Sound Toolsstereo hard-disk recording and editing system with 16-bit audio, 44.1 kHz or 48 kHz sample rate adopting the SDII proprietary audio format163relies on a Sound Accelerator NuBus card connected to an external 2-channel AD converter and Sound Designer II software running on Macintosh SE and Mac II164
Sound Designer IISound AcceleratorAudiomedia I
1991Pro ToolsMac-based 4-track digital production system handled by ProEdit (editing software) and ProDeck (mixing software)MIDI sequencing and automation165166
ProEditProDeck
1992Pro Tools 1.14–16 voices support in mixing using up to four cards/interfaces167
Sound Tools IIsupport for Pro Master 20 interface with 20-bit A/D conversion168
1993Pro Tools IIediting and mixing software merged in a single application called Pro Tools with the component DAE (Digidesign Audio Engine)4 voices support169170
Audiomedia II
1994Pro Tools II TDM (2.5)TDM technology enables real-time effects to run as software plug-ins; up to 4 NuBus cards can be linked together171172
Pro Tools III16–48 voices on NuBus-based Mac systems (up to three cards linkable)173DSP Farm NuBus card equipped with 3 Motorola 56001 chips (40 MHz clock speed) for additional processing power174software editing functionality improved
DSP Farm
1996Pro Tools III PCI16–48 voices for PCI-based Mac systems (up to 3 cards linkable)88x series interfaces with 8 channels I/O, 16-bit AD/DA converters, AES/EBU I/O175176DSP Farm PCI card equipped with 4 Motorola 56002 chips (66 MHz clock speed)177
Pro Tools 3.21888 I/O, 882 I/ODSP Farm
1997Pro Tools 4Pro Tools Project CardWAV and QuickTime file support; Sound Designer file editing features integrated into AudioSuite toolsetruns on Pro Tools III NuBus/PCI systems or without TDM hardware with limitations (Project or PowerMix versions)destructive editing integrated, fade improvements, Strip Silence, continuous playback during editing, independently resizable tracks, up to 26 track groups, automation extended to all mixer and plug-in parameters, new automation modesLoop Record, Half-Speed Record, Destructive Record, QuickPunch (punch-in and out recording during playback)Edit window configurations can be saved and recalled with Memory Locations178179
Pro Tools | 2424–48 or 32–64 channels of 24-bit audio I/O support via the d24 PCI card18088x interface line upgraded with 24-bit AD converters, 20-bit DA converters (888|24), 20-bit AD/DA converters (882|20)181
Pro Tools 4.1d24888|24, 882|20
1998Pro Tools | 24 MIX16–48 I/O channels, 64 voicesMIX, MIXplus and MIX3 system configurations with one MIX Card and up to two MIX Farm PCI cards equipped with 6 Motorola Onyx chips182
Pro Tools 4.3MIX CardMIX Farm
ADAT Bridge I/O20-bit digital interface with 16 ADAT optical input channels183
ProControlfirst dedicated control surface for Pro Tools using Ethernet connection with microphone and line inputs184
1999Pro Tools 5integrated MIDI and audio editing/mixing,185 MIDI piano-roll display, graphic MIDI velocity editing, MIDI quantizesingle-stroke key commands for editing, Region Replace, floating video window186
2000Pro Tools LEDigi 001 (LE)mid-level recording system with 24 tracks, 8 analog I/O channels, 2 microphone preamps, 24-bit AD/DA, digital I/O and MIDIrack-mountable interface connected with a PCI card running a new feature-limited software line ("Light Edition") with RTAS host-based processing (without DSP)187188
Control|24touch-sensitive control surface equipped with 24 Focusrite preamps189
2001Pro Tools Freefree version with essential features, based on version 5, runs natively on OS 9, OS 8.6, Windows 98, Windows ME8 audio tracks, 48 MIDI tracks, RTAS support
Pro Tools 5.1surround mixing, Beat Detective (TDM)190
2002Pro Tools | HDHD software and hardware line adds support for 192 kHz and 96 kHz sample rates, runs with 192 I/O and 96 I/O interfaces providing 32–96 I/O channelsHD1–HD3 systems are based on one HD Core adding up to two HD Process PCI-based cards equipped with 9 Motorola 56361 DSP chips (100 MHz clock speed)96/48/12 tracks at 48/96/192 kHz sample rates with HD1 systems128/64/24 tracks at 48/96/192 kHz sample rates with HD2/HD3 systems191192193
Pro Tools 5.3.1192 I/O, 96 I/OSYNC, MIDI, PRE
HD CoreHD Process
Mbox (LE)low-cost USB-powered audio interface with 2 analog inputs, 1 mic preamp, S/PDIF digital I/O, bundled with Pro Tools LE software194
Digi 002 (LE)mid-level FireWire audio interface with 8 analog inputs, 24-bit/96 kHz converters, touch-sensitive control surface, running Pro Tools LE 5.3.2 on Windows XP and Mac OS 9195196
2003Pro Tools 6support for Mac OS X platform (OS 9 dropped), GUI redesign, real-time plug-in insertion for TDM systemsRelative Grid mode, support for timeline vertical selectionDigibase (workspace browser and database environment) for media/project management256 MIDI tracks, Groove Template, additional MIDI commands, Import Session Data replaces Import Tracksnew DigiRack plug-ins, more powerful LE version197
Pro Tools 6.1support for Windows XP and ReWire, support for AAF198
Digi 002 Rack (LE)mid-level FireWire audio interface with up to 18 I/O channels, 4 mic preamps, 24-bit/96 kHz AD/DA, support for 32 tracks with Pro Tools LE software199
HD Accel (HD)DSP cards expansion equipped with 9 Motorola 56321 chips (200 MHz clock speed)twice the power as the HD Process cards extends track count to 192/96/36 tracks at 48/96/192 kHz sample rates (combined with one HD core card)200201
2004Pro Tools 6.4+12 dB fader rangesupport for Command 8 control surface, Automatic Delay Compensation, TrackPunch, input monitoring on single tracks (HD)202
Pro Tools 6.9160 auxiliary tracks, 128 busses, Surround Panner support, selectable PFL/AFL solo paths (HD)selectable solo mode (Latch or X-OR), new keyboard shortcuts, I/O setup improvements203
ICON D-ControlICON D-Commandmodular control surface line with 16–32 (D-Control) or 8–24 (D-Command) touch-sensitive faders and HD3 Accel DSP system204
2005Pro Tools M-Poweredstandalone feature-limited product line bundled with M-Audio interfaces, same as Pro Tools LE205
Pro Tools 7HD Accel PCIe (HD)multi-threading RTAS engine improves performance on multi-core systems, support for 10 sends per track, Instrument tracks, Region Groups, region looping, real-time MIDI processing, new session format with Mac/PC interoperability; 160 I/O at 96 kHz (HD)206
VENUEnew line of modular digital mixing consoles with DSP and integrated playback and recording with Pro Tools207
Mbox 2 (LE)second generation of the Mbox USB audio interface208
2006Pro Tools 7.11support for Intel-based Macs, Hybrid and Xpand! software sampler plug-ins added
Pro Tools 7.2digital VCA groups, enhanced automation, enhanced track grouping system, extended support for contextual menus, Dubber and Field Recorder enhancements; support for multiple Video tracks (HD)209
Pro Tools 7.3Dynamic Transport, Windows Configurations, Key Signature timeline ruler, MIDI selection enhancements, fade editing enhancements, continuously-resizable tracks, mixer configurations changes possible without stopping playback, mouse scroll wheel and right-click enhancements, Memory Location and Digibase enhancements, Signal Tools and Time Shift plug-ins added, MIDI data can be exchanged with Sibelius scoring software210
Mbox 2 Pro (LE)Mbox 2 Mini (LE)new formats/variants of Mbox 2
2007Pro Tools 7.4Elastic Audio, Digibase browser enhancements211
Digi 003 (LE)Digi 003 Rack (LE)
Mbox 2 Micro (LE)portable USB interface with mini-jack stereo output and bundled with Pro Tools LE; support limited to 44.1/48 kHz sample rates212
2008Pro Tools 8revamped user interface, support for 10 inserts per track, Playlist view, and enhanced track compositing tools, support for multiple automation lanes view, Elastic Pitch, MIDI Editor, Score Editor, AIR Creative Collection; Automatic Delay Compensation on sends (HD)213
Digi 003 Rack + (LE)
2009Eleven Rackguitar effects processor with Pro Tools LE DSP
Mbox (LE)Mbox Pro (LE)Mbox Mini (LE)third generation, first full release by Avid
2010Pro Tools 8.1HEAT software add-on (HD)
Pro Tools 9"standard" version replaces LE and M-Powered lines, gets most of the HD-only software features, and can be run on native systems with ASIO or Core Audio driver protocolsfull HD features can be purchased with Complete Production Toolkit 2added 7.0/7.1 surround support (HD)214215
HD I/O, HD OMNI, HD MADI, SYNC HDHD Series Interfaces introduced (replaces the previous "blue" HD series)216
HD NativePCI card or Thunderbolt interface, enables to run HD software on up to two HD (or HD-compatible) interfaces with low-latency performance and without DSP217
2011Pro Tools | HDX96 voices, 512 Instrument tracks, 128 aux inputs, 1 video track, 128/64/32 tracks at 48/96/192 kHz sample rates (standard version)256–768 voices, 512 Instrument tracks, 512 aux inputs, 64 video tracks, 256–768 tracks at 48 kHz sample rates, 64–192 I/O channels (HDX systems with 1–3 HDX cards)HDX replaces HD Core systems and HD1–HD3 configurations; each PCI card is equipped with 18 Texas Instruments DSP chips (350 MHz clock speed), can run AAX DSP plug-insAAX (Avid Audio eXtension) plug-in format introduced with 64-bit ready SDK (32-bit still used); AAX DSP plug-ins replace TDM plug-ins in HD systems, RTAS still supportedimproved recording playback performance (disk cache, NAS support, disk scheduler improvements)Clip Gain, disk cache, real-time fades, 4x maximum Automatic Delay Compensation, 24-hour timeline, support for mixed file formats and 32-bit float resolution, interface improvements, Avid Channel Strip plug-in218219
Pro Tools 10HDX
2013Pro Tools 11application upgraded with 64-bit architecture. 32-bit RTAS and TDM plug-in support dropped in favor of 64-bit AAX format; support discontinuation for HD Accel systemsOffline bouncing, Dynamic Plug-In processing optimizes session performance; up to 16 sources can be bounced simultaneously, advanced metering options (HD)220
2014DuetQuartet2-channel and 4-channel USB interfaces/monitor controllers with 192 kHz AD/DA conversion developed by Apogee
2015Pro Tools | Firstfree software line with essential features, cloud-based sessionsup to 96 kHz sample rate, 16 tracks per type (audio, MIDI, Instrument, and auxiliary), 4 I/O channels, MIDI editor, Elastic Time, Elastic Pitch, Workspace, AAX Native and AudioSuite221222
Pro Tools 12available as monthly or yearly subscription; metadata tagging, updated I/O setup223
Pro Tools 12.1increased track count, AFL/PFL solo modes, copy to sends, native HEAT support (HD)224
Pro Tools 12.2VCAs, Disk Caching, advanced metering options unlocked to standard version225
Pro Tools 12.3Commit, fade presets, batch fades, clip graphic overlay226
Pro Tools 12.4Track Freeze, fade workflows227
2016Pro Tools 12.5Cloud Collaboration, updated Avid Video Engine, send to playback (Interplay)228
Pro Tools 12.6Clip Effects, Layered Editing, playlist improvements229
Pro Tools 12.7project revision history, Workspace improvementssoftware support for Pro Tools | MTRX230
2017Pro Tools 12.8Pro Tools | MTRXnative Dolby Atmos integration and NEXIS optimization, Parallel Task Optimization (HD); Workspace and project enhancements; Smart Tool support for fade shapes; Cloud Collaboration (First)231
Pro Tools 12.8.2Ambisonics VR Track support, Dolby Atmos enhancements, improved MIDI editing and recording features, Batch renaming features232
2018Pro Tools 2018.1iLok Cloud support, Track Presets, assignable target playlist, retrospective MIDI record, MIDI editing enhancements, EQ Curve can be shown in the Mix window, improved Import Session Data233first version to adopt year and month of release as a version numbering scheme
Pro Tools 2018.4"Pro Tools | HD" software line rebranded as "Pro Tools | Ultimate"bug fixes and stability improvements234
Pro Tools 2018.7real-time search in track inserts and I/O (busses and sends), multiple selection within I/O and interface menus, playlist navigation shortcuts added, Relative Grid mode extended to cut, copy, paste, and merge, retrospective MIDI record enhancements, Low Latency Monitoring enhancements235
Pro Tools 2018.12bug fixes and stability improvements236
2019Pro Tools 2019.5384–96 voices on native systems (Ultimate), 1024 MIDI tracksperformance improvements (HDX / HD Native)continuous playback on most timeline and track interactions, key commands added237
Pro Tools 2019.6bug fixes238
Pro Tools 2019.10support for up to 130 outputs with Dolby Audio Bridge, multi-stem bounce in a single file (Ultimate)updated Avid Video Engine with 4K/60 fps support and H.264 playback performance improvements, steep breakpoint smoothing option added, AAF importing improvements, SMPTE ID support for wave files, key commands added239
Pro Tools 2019.12bug fixes and stability improvements240
2020Pro Tools 2020.3Pro Tools | MTRX StudioFolder Tracks, Resources section added in System Usage, H.264 performance improvements extendedsupport for Pro Tools | MTRX Studio241242
Pro Tools 2020.5optimizations for session storage on cloud services243244
Pro Tools 2020.9support for Ableton Link for timeline and transport synchronization over LANsupport for SDII conversion to BWF WAV on import (macOS only), support for BWF RF64 audio import and playback; Cloud Collaboration improvements245246
Pro Tools 2020.11Pro Tools | CarbonDark Theme, Space Clips; integration of Melodyne Essential software, audio to MIDI conversion, QuickTime MOV import/export functionalitysupport for low-latency AAX DSP mode (Hybrid Engine) with Pro Tools | Carbon interfaces512 Master faders, support for Dolby Atmos ADM BWF export (Ultimate)performance improvements of offline bounces and playback with low buffer sizes247248
Pro Tools 2020.12support for Audio to MIDI drag and drop from Workspace/Finder/File Explorer; Dolby Atmos ADM BWF export249250
2021Pro Tools 2021.3Pro Tools | Sync XVirtual MIDI keyboard; Dark Theme, Dolby Atmos, Dynamic Transport and waveform display performance improvementsHD driver updated to support Message Signaled Interrupts (MSI)support for Sync X master clock/synchronization device and macOS Big Sur251252
Pro Tools 2021.62048 voices and 2048 audio tracks at all sample rates; Hybrid Engine support on HDX systems (Ultimate)256 tracks at all sample rates (Standard); 64 I/O channels at all sample ratesfull UI customization, interchangeable track width; full support of plug-in drag between tracks of different widthssupport for delay compensation on side chains on non-HDX systemssupport of HEVC, AAC, ALAC and greater-than-stereo track widths for QuickTime video import/exportPlayback Engine performance and stability improvements (Intel-based Macs only): Intel Turbo Boost support, low buffer sizes optimizations, limit number of real-time threadsSync X and Sync HD improvementsApple Silicon support for Pro Tools software253254
Pro Tools 2021.7bug fixes255
Pro Tools 2021.10flexible track routing (Ultimate), new UI customization parameters, support for Native Instruments Komplete Kontrol and Pro Tools | Carbon remote controlApple Silicon support for HDX, HD Native and Avid Video Engine256257
Pro Tools 2021.12macOS Monterey support; bug fixes258259

See also

  • Music portal

Footnotes

Bibliography

Wikimedia Commons has media related to Pro Tools.

References

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