lastIntroNote equ song+26*2
lastNote      equ message

soundIndex dw song
soundWait  db 0

playNote:

	mov si, [soundIndex]

	cmp si, lastNote
	jb .nextNote

	; Go back to the beginning
	mov si, lastIntroNote

	.nextNote:
	dec byte [soundWait]
	cmp byte [soundWait], -1
	jne .end

	lodsw
	mov cx, ax
	and ah, 00011111b

	; Set the frequency
	out 0x42, al
	mov al, ah
	out 0x42, al

	shr ch, 5
	mov [soundWait], ch

	mov [soundIndex], si

	.end: ret