mockingboard_init.s
	assume slot #4
	only one channel
	sets up interrupt handler
tracker_init.s
	clear mirror registers in ZP to 0
	($70-$83?)
	if any register always same, set it ($38 to mixer?)
	

play_frame.s
	has amplitudes to rotate through on A/B channel
	
	; NNNNEEEC -- c=channel, e=end, n=note
	; 16 notes, 8 lengths, 2 channels

2024 Maze 02

Volumes:

Track0 
	A:	D.C.A.9 if 4/8 long
		D9 if 2 long

	B:	9.5.4.3 if 4/8 long
		95 if 2 long

Track1:
	A:	D.C.A.9 if 4/8 long
		D9 if 2 long

	B:	Either all F or

		F.C.B.A if 4/8 long
		FB if 2 long