can one reliably find out which snd_ctl_elem controls the gain of a
specific channel in a pcm stream?

looking at what snd_ctl_elem_list() returns for the audiophile (ice1712) 
there does not seem to be a portable way to do so. i could enumerate them
and say 'oh yeah, playback mixer 1 must be channel 1 in the playback
stream' but this obviously isn't the right way to do it.

is there a way to do this programmatically (without heuristics, string
parsing and other alchemy) or does this in fact require human user
knowledge? 

tim


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