Is play_Audio a good name? I think play or playback would be better.
is playback.py a good name? would IO be better?
should play_Audio and export_WAV be Audio class methods instead? They are implemented in playback.py (as they should be), but is there any reason not to attach them to Audio objects (or any reason for the opposite)?
some issues between these 2 files:
play_Audioa good name? I thinkplayorplaybackwould be better.playback.pya good name? wouldIObe better?