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> Tony I would call what you describe a predorso-postalveolar, a class of
> sounds which probably doesn't occur in non-disordered human speech although
> I can produce them easy enough. The stops clearly have a weird half-palatal
> half-retroflex sound, and I think I have heard Swedish speakers with
> cerebral palsy-related speech disorders use them in place of real
> retroflexes. If you already have an /ʎ/ and want a symbol without a
> diacritic you could use ȴ U+0234, the symbol which Sinologist use for a
> alveopalatal lateral, i.e. a sound which is to [ɕ] what [ʎ] is to [ç] and
> [l] is to [s] -- i.e. pronounced with the part of the tongue behind the
> lamina against the front of the palate behind the alveolar ridge, differing
> from your sound mainly in that the apex will normally touch the back of the
> *upper* teeth. It is not accepted by the IPA on the usual grounds that is
> doesn't contrast with [ʎ] in any known human language. In my ASCII
> transcription system for Sohlob languages which I use in identifiers and
> the like [ʟ] is _ll_, [ʎ] is _lly_ and [ȴ] is _ly_.
>
> And, voiceless approximants certainly exist, although usually only as
> allophones of voiced approximants or voiceless fricatives. Try the /j w l
> r/ after aspirated stops in English. They are certainly voiceless but less
> fricative than a true [ç ʍ ɬ]. In effect the aspiration is realized as
> devoicing in the approximant.
>
> Jim, what you probably got there is [ɕ] an alveopalatal sibilant as I
> described above. While languages usually don't contrast /ɕ/ with /ʃ/
> alveopalatal fricatives /ɕ ʑ/ contrasting with retroflex fricatives /ʂ ʐ/
> occur in Swedish, Polish, Russian and Mandarin for example. A language
> arguably contrasting /ɕ/ and /ʃ/ is Norwegian but there a merger is under
> way. You can find audio for all three sounds on Wikipedia:
>
> [ɕ]
>
> https://en.m.wikipedia.org/wiki/File:Voiceless_alveolo-palatal_sibilant.ogg
>
>
> https://en.m.wikipedia.org/wiki/Voiceless_alveolo-palatal_fricative
>
> [ʃ]
>
> https://en.m.wikipedia.org/wiki/File:Voiceless_palato-alveolar_sibilant.ogg
>
> https://en.m.wikipedia.org/wiki/Voiceless_postalveolar_fricative
>
> [ʂ]
>
> https://en.m.wikipedia.org/wiki/File:Voiceless_retroflex_sibilant.ogg
>
> https://en.m.wikipedia.org/wiki/Voiceless_retroflex_fricative
>
> If you are on Windows you can find installation instructions at
>
> https://en.m.wikipedia.org/wiki/Help:Media_(audio_and_video)
>
> Most Android phones and tablets should be able to play them without
> installing anything extra.
>