musix 0.3.3

Music player library for esoteric audio formats (music from C64,Amiga etc)
Documentation 
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src/audio.c:update_audio() drives the audio state machine. It is called from:

 - src/custom.c:DMACON()
 - src/custom.c:ADKCON()
 - src/custom.c:hsync_handler()
 - All audio register writes (handled in audio.c)

src/custom.c calls src/audio.c:update_audio() on hsync_handler:
 1. update_audio()
 2. fetch new sample for audio state machine if necessary