Fix Speed Shoes music in different acts in Sonic 1

Hi, this is a special guide that only can be used when you have these things in your hack:

• Play different songs on different acts.
  
• How to make speed shoes play music.

If you have the 2 codes in the same hack, you must have a problem. When you take a Speed Shoes monitor, and the song starts to playing, all good, but when the music wears off, and if you are in any act 2 or act 3, the game plays the act 1's music.

If you have this problem, this is the solution.

First, in sonic1.asm, search this: (Obj01_ChkShoes and you must see this:


Obj01_ChkShoes:
tst.b ($FFFFFE2E).w ; does Sonic have speed shoes?
beq.s Obj01_ExitChk ; if not, branch
tst.w $34(a0) ; check time remaining
beq.s Obj01_ExitChk
subq.w #1,$34(a0) ; subtract 1 from time
bne.s Obj01_ExitChk
move.w #$600,($FFFFF760).w ; restore Sonic's speed
move.w #$C,($FFFFF762).w ; restore Sonic's acceleration
move.w #$80,($FFFFF764).w ; restore Sonic's deceleration
move.b #0,($FFFFFE2E).w ; cancel speed shoes
tst.b ($FFFFFE2D).w ; does Sonic have invincibility?
moveq #0,d0
move.b ($FFFFFE10).w,d0
cmpi.w #$103,($FFFFFE10).w ; check if level is SBZ3
bne.s playthemusic
moveq #5,d0 ; play SBZ music
playthemusic:
lea (MusicList).l,a1 ; load music playlist
move.b (a1,d0.w),d0 ; add d0 to a1
jsr (PlaySound).l ; play normal music

Well, to fix the error, replace everything with this:


; Speed Shoes Music fixed

Obj01_ChkShoes:
tst.b ($FFFFFE2E).w ; does Sonic have speed shoes?
tst.w Obj01_ExitChk ; if not, branch
tst.w $34(a0) ; check time remaining
beq.s Obj01_ExitChk
subq.w #1,$34(a0) ; subtract 1 from time
bne.s Obj01_ExitChk
move.w #$600,($FFFFF760).w ; restore Sonic's speed
move.w #$C,($FFFFF762).w ; restore Sonic's acceleration
move.w #$80,($FFFFF764).w ; restore Sonic's deceleration
move.b #0,($FFFFFE2E).w ; cancel speed shoes
tst.b ($FFFFFE2D).w ; does Sonic have invincibility?
bne.s Obj01_ExitChk
moveq #0,d0
move.b ($FFFFFE10).w,d0
cmpi.w #$103,($FFFFFE10).w ; check if level is SBZ3
bne.s playthemusic
moveq #5,d0 ; play SBZ music
playthemusic:
cmpi.b #$0,($FFFFFE11).w ; is this act 1?
bne.s Obj01_SpSGetBgm2 ; if not, branch
lea (MusicList1).l,a1 ; load Music Playlist for Acts 1
bra.s Obj01_SpSPlayMusic ; go to PlayMusic

Obj01_SpSGetBgm2:
cmpi.b #$1,($FFFFFE11).w ; is this act 2?
bne.s Obj01_SpSGetBgm3 ; if not, branch
lea (MusicList2).l,a1 ; load Music Playlist for Acts 2
bra.s Obj01_SpSPlayMusic ; go to PlayMusic

Obj01_SpSGetBgm3:
cmpi.b #$2,($FFFFFE11).w ; is this act 3?
bne.s Obj01_SpSGetBgm4 ; if not, branch
lea (MusicList3).l,a1 ; load Music Playlist for Acts 3
bra.s Obj01_SpSPlayMusic ; go to PlayMusic

Obj01_SpSGetBgm4:
cmpi.b #$3,($FFFFFE11).w ; is this act 4?
bne.s Obj01_SpSPlayMusic ; if not, branch
lea (MusicList4).l,a1 ; load Music Playlist for Acts 4

Obj01_SpSPlayMusic:
move.b (a1,d0.w),d0
jsr (PlaySound).l ; play normal music

; End of Speed Shoes music.

That's it. If you have problems, please, say it.

 

You know, whenever I look back at that "different songs in different acts" guide I wrote years ago, I realise how bad it is. I should really release the updated code I ended up to use in my hack, since I improved it a lot, and it already fixes the issues you're addressing here.

 

Edit: nvm. Misread your code. carry on.