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polyphonic WAV playback on M4 #1221

@ladyada

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@ladyada

on big-memory chips like M4, if we restrict to all-same-samplerate then we could implement 4-simultaneous WAV playbacks?
related:
#987

i wrote some code to do this in pure python but its not fast enough to do on the fly :/
this is for Trellis M4 projects + would also let me replace the audio FX boards with circuitpython. also great for props - a common request is a 'background sound' and then a triggered 'foreground' sound and no audio boards can do it unless you drop a ton o' $

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