
files needed:

    sound.h - audio functions declarations

    sound.s - asm source code to interface the audio functions from C

    audio.bin - 16KiB binary image containing the audio system (extracted from 
    						the 2nd 16KiB block of player.gb)

    (audio.asm and audio.inc are for RGBDS)

modifications:

    in the file "crt0.s" you need to change the stack to 0xDF80:

    [...]
    init:
        di
        ;; Stack at the top of memory.
        ld  sp,#0xdf80
    ;          ^^^^^^^ change this here
    [...]


    the audio system's memory is in the 0xDF80-0xDFFF area
  
