Some languages have a velar approximant that is produced with the body of the tongue bunched up at the velum and simultaneous pharyngealization. This gives rise to a type of retroflex resonance resembling [ɻ]. The extension to the IPA recommends the use of the "centralized" diacritic combined with the IPA sign for the English alveolar approximant (as in ⟨ɹ̈⟩) to distinguish the bunched realization from the prototypical apical [ɹ], which may be specified as ⟨ɹ̺⟩. Typically, the diacritic is omitted, so that the sound is transcribed simply with ⟨ɹ⟩ or ⟨ɻ⟩ (in broader transcriptions: ⟨r⟩), as if it were a coronal consonant.
Some languages have a voiced velar approximant that is unspecified for rounding, and therefore cannot be considered the semivocalic equivalent of either [ɯ] or its rounded counterpart [u]. Examples of such languages are Catalan, Galician and Spanish, in which the approximant consonant (not semivowel) unspecified for rounding appears as an allophone of /ɡ/.
Eugenio Martínez Celdrán describes the voiced velar approximant consonant as follows:
The symbol ⟨ɣ̞⟩ may not display properly in all browsers. In that case, ⟨ɣ˕⟩ should be substituted. In broader transcriptions, the lowering diacritic may be omitted altogether, so that the symbol is rendered ⟨ɣ⟩, i.e. as if it represented the corresponding fricative.
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François (2010), pp. 397–400. - François, Alexandre (2010), "Phonotactics and the prestopped velar lateral of Hiw: Resolving the ambiguity of a complex segment" (PDF), Phonology, 27 (3): 393–434, doi:10.1017/S0952675710000205, S2CID 62628417 http://alex.francois.online.fr/data/AlexFrancois_Hiw-lateral_Phonology_published.pdf
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Cruttenden (2014), pp. 225–6. - Cruttenden, Alan (2014), Gimson's Pronunciation of English (8th ed.), Routledge, ISBN 9781444183092
Cruttenden (2014), pp. 225–6. - Cruttenden, Alan (2014), Gimson's Pronunciation of English (8th ed.), Routledge, ISBN 9781444183092
Cruttenden (2014), pp. 225–6. - Cruttenden, Alan (2014), Gimson's Pronunciation of English (8th ed.), Routledge, ISBN 9781444183092
Cruttenden (2014), pp. 225–6. - Cruttenden, Alan (2014), Gimson's Pronunciation of English (8th ed.), Routledge, ISBN 9781444183092
Martínez Celdrán (2004), pp. 203–204. - Martínez Celdrán, Eugenio (2004), "Problems in the Classification of Approximants", Journal of the International Phonetic Association, 34 (2): 201–210, doi:10.1017/S0025100304001732, S2CID 144568679 https://www.researchgate.net/publication/231180567
Martínez Celdrán (2004), pp. 202–203. - Martínez Celdrán, Eugenio (2004), "Problems in the Classification of Approximants", Journal of the International Phonetic Association, 34 (2): 201–210, doi:10.1017/S0025100304001732, S2CID 144568679 https://www.researchgate.net/publication/231180567
See e.g. Carbonell & Llisterri (1992). - Carbonell, Joan F.; Llisterri, Joaquim (1992), "Catalan" (PDF), Journal of the International Phonetic Association, 22 (1–2): 53–56, doi:10.1017/s0025100300004618, S2CID 249411809 http://liceu.uab.cat/~joaquim/publicacions/Carbonell_Llisterri_92_Catalan_IPA.pdf