testing for alsa device

[Carl Karsten]

How should my python code test to see if "hw:1,0" is a valid alsa device?
source if it matters.

or whatever string gets passed to my app:
 https://github.com/CarlFK/voctomix-outcasts/blob/master/ingest.py#L216

The plan is if it fails the test, fall back to audiotestsrc


-- 
Carl K
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