Sounds

This is a sub-page of Development:Super Mario World 2: Yoshi's Island.

Music#

In 日本_Ver0\sfc\back_up\ys_game.asm.BAK6 to 日本_Ver0\sfc\back_up\ys_game.asm.BAK10, the music tracks in the game were the following unnamed values:

BGM_NO_DATA EQU $   ;[BGM_NO]
        HEX 02H ;[0]
        HEX 01H ;[1]
        HEX 03H ;[2]
        HEX 06H ;[3]
        HEX 08H ;[4]

The tracks then received labels in 日本_Ver0\sfc\back_up\ys_game.asm.BAK11, where they were joined by a Ghost House theme that didn't make the final game:

BGM_NO_DATA EQU $   ;[BGM_NO]
        HEX 01H ;[0] 地上
        HEX 01H ;[1] アスレチック
        HEX 01H ;[2] 水中
        HEX 01H ;[3] 地下
        HEX 01H ;[4] お城
        HEX 01H ;[5] おばけ屋敷

Overworld
Athletic
Underwater
Underworld
Castle
Haunted House

These values differ from the presumably final ones found in 日本_Ver0\sfc\ys_game_edit.asm:

Some of the early maps use the older values. For example, unused submarine areas sbmarin1 and sbmrin1a use 02 for their BGM ID, which lines up well with the earlier track list, given that it used to be the underwater theme.

Voices#

There's a curious table in 日本_Ver0\sfc\back_up\ys_init.asm.BAK0 that defines different voices for the player transformations. Small Yoshi, Tree Yoshi, "Mister" Yoshi, and Plane Yoshi are early forms that are no longer present in the final game.

;************************************************************************
;*        Voice initial                (VOICEST)    *
;*        in        [X] <-- Voice pointer            *
;************************************************************************
TRSTBL        EQU    $
        LWORD    1DA000H,1DCC00H,1E8000H,1EB000H,1F8000H,1FB000H,1FE000H
;
;
TRSSS        EQU    $
        WORD    9756-2000    ; "Big"
        WORD    12316-3000    ; "Small"
        WORD    12044-3000    ; "Car"
        WORD    12156-3000    ; "Mogura" [Mole]
        WORD    12044-3000    ; "Ki" [Tree]
        WORD    11868-2800    ; "Mr"
        WORD    5948-1000    ; "Plane"

Fortunately, the 日本_Ver0\sound\back_up directory contains these voice files and more! Interestingly, some of the lines are from [https://en.wikipedia.org/wiki/Super_Mario_Bros.:_The_Great_Mission_to_Rescue_Princess_Peach! Super Mario Bros.: The Great Mission to Rescue Princess Peach!], a now-obscure anime film from 1986 (which can be watched on YouTube here).