Jeremy Kahn@spacyoddity @jonny one effect of treating these as articulatory gesture targets on different tracks is that "coarticulation" self-explains:
a [ə] schwa sound has no tongue-position targets, but does have a laryngeal activation target, so if it's preceded by a [t] and followed by a [k] it will tend to trace tongue position space from high/front to high/back and sound more like [ɨ].
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