Sonic Adventure Music in Sonic 1

prepare for a tl;dr post guys.

As you may or may not know, I've been experimenting with different ways to play full PCMs over the past few weeks, and came up with a new S1 PCM driver based on the one that came with drx's code template which can support a 3-byte length, variable pitch, and looping (based on a looping flag). The driver doesn't work perfectly in S1 yet, there's still some distorted sound. Tweaker says the DAC works best when the 68K is frozen, but I don't know how to do that without slowing down/stopping the game, so some music sounds distorted and crappy.

Anyway, here's the ROM. Music choices are:

GHZ = Emerald Coast (Azure Blue Sky)
MZ = Red Mountain (Mt. Red - A Symbol Of Pride)
SYZ = Casinopolis (The Dreamy Stage)
LZ = Lost World (DANGER - Chased By A Rock!)
SLZ = Speed Highway (whatever the first song's name is)
SBZ = Final Egg (Mechanical Resonance)
Boss = SCD Jap. Boss Theme (yes, I know this isn't from Sonic Adventure)
FZ = Perfect Chaos

GHZ and LZ sound a little distorted, but they still sound like the original song.





I'll also take this topic to release the new driver, with instructions on how to integrate it into the ROM. Here's the new sound driver. It doesn't replace the old one, but instead works as a second driver for the PCM songs. To make this driver work with the S1 ROM, first put this at the end of the ROM:

[codebox]PCMDriverLoad: ; XREF: GameClrRAM; TitleScreen
move.w #0,($A11200).l
move.w #$100,($A11100).l
move.w #$100,($A11200).l

WaitForZ80_2:
btst #0,($A11100).l
bne WaitForZ80_2

lea (Kos_Z80_2),a0
lea ($A00000).l,a1
move.W #KosZ802End-Kos_Z80_2,d1

LoadDriver:
move.b (a0)+,(a1)+
dbf d1,LoadDriver
rts[/codebox]

That's the subroutine that loads the PCM Driver. You'll also need to insert the second sound driver after that, which would be like this:

[codebox]Kos_Z80_2:
incbin sound\PCMD.bin
KosZ802End:[/codebox]

PCM playing is handled at the beginning of the subroutine Sound_81to9F. At the beginning of Sound_81To9F, put a jump to SoundDriverLoad, which loads the original DAC sound driver for regular songs. To actually play a PCM song, put this before the jump to SoundDriverLoad:

[codebox] cmpi.b #$81,d7
beq.l PlayMusic81
jmp Continue8129F[/codebox]

Replace the #$81 and PlayMusic81 with the respective values (e.g. #$82 and PlayMusic82) for respective songs. After that code, we need to put the actual code that plays the song, which would look like this:

[codebox]; ---------------------------------------------------------------------------
PlayMusic81:

jsr Sound_E4

move.w #$100,($A11100).l ;Stop the Z80

WaitZ80_81:
btst #0,($A11100).l
bne WaitZ80_81 ;Wait for z80 to halt

jsr PCMDriverLoad



move.b #1,($a00039).l ;Turn PCM Playing Flag ON


move.b #((Music81&0xFF0000)>>16),($a0003c).l ;addr - $__xxxx
move.b #((Music81&0xFF00)>>8),($a0003b).l ;addr - $xx__xx
move.b #(Music81&0xFF),($a0003a).l ;addr - $xxxx__


move.b #(((Music82-Music81)&0xFF0000)>>16),($a0003f).l ;addr - $__xxxx
move.b #(((Music82-Music81)&0xFF00)>>8),($a0003e).l ;addr - $xx__xx
move.b #((Music82-Music81)&0xFF),($a0003d).l ;addr - $xxxx__


move.b #$06,($a00046).l ;sample rate (06=8000KHz)

move.b #$01,($a00048).l ;looping flag ($00=no,$01=yes)

move.w #$0,($A11100).l ;Start the Z80

rts

; ---------------------------------------------------------------------------[/codebox]

Again, replace all respective values. The Music82-Music81 is signifying the length; Music82 starts at the end of Music81, so Music82-Music81 is the length of the song Music81.

Make more subroutines just like that and do more compares for more PCMs you want to play. After the end of the subroutine PlayMusic81, just put the label Continue8129F. And you're done. The whole thing should look like this:

[codebox]Sound_81to9F: ; XREF: Sound_ChkValue
cmpi.b #$81,d7
beq.l PlayMusic81
jmp Continue8129F

; ---------------------------------------------------------------------------
PlayMusic81:

jsr Sound_E4

move.w #$100,($A11100).l ;Stop the Z80

WaitZ80_81:
btst #0,($A11100).l
bne WaitZ80_81 ;Wait for z80 to halt

jsr PCMDriverLoad



move.b #1,($a00039).l ;Turn PCM Playing Flag ON


move.b #((Music81&0xFF0000)>>16),($a0003c).l ;addr - $__xxxx
move.b #((Music81&0xFF00)>>8),($a0003b).l ;addr - $xx__xx
move.b #(Music81&0xFF),($a0003a).l ;addr - $xxxx__


move.b #(((Music82-Music81)&0xFF0000)>>16),($a0003f).l ;addr - $__xxxx
move.b #(((Music82-Music81)&0xFF00)>>8),($a0003e).l ;addr - $xx__xx
move.b #((Music82-Music81)&0xFF),($a0003d).l ;addr - $xxxx__


move.b #$06,($a00046).l ;sample rate (06=8000KHz)

move.b #$01,($a00048).l ;looping flag ($00=no,$01=yes)

move.w #$0,($A11100).l ;Start the Z80

rts

; ---------------------------------------------------------------------------

Continue8129F:
jsr SoundDriverLoad
cmpi.b #$88,d7 ; is "extra life" music played?
bne.s loc_72024 ; if not, branch
tst.b $27(a6)[/codebox]

It should be fairly obvious how to add more songs. I hope you understood what to do, because I suck at explaining things =P

Hopefully this will open up the gates to much more awesome-sounding music in Sonic games.

 

I know, but I have no idea how to get it to be better quality. I'm not that experienced with the S1 sound driver =P

As I said before, you said something about freezing the 68K to get better DAC quality. Is there any other way to get better quality? I still want the game to be playable =P

 

HAY GUYZ

Sonic Rush music doesn't really fit with Sonic 1 levels though =P

And I can't really do much about the quality, sadly.

 

1 is because of the shifting of the logo data, and it's very minor and probably won't be fixed anytime soon (even though it would probably be really easy to fix with this new driver). The pause bug is the result of the pausing stopping the Z80, which writes data to the DAC in this driver, and not starting it again when unpaused. I'll fix that soon. Looping sounds unnatural because Sonic Adventure songs don't have very many songs that have spots where it can loop back to the beginning perfectly (it's a data bug, not a driver bug). And I don't really know how to fix the speed bug, but you can 'fix' it by giving the speed sneakers its own music.

 

I figured out how to fix the crappy sound without any (noticeable =P) slowdown in gameplay.

Fixed ROM

New Music Choices:

GHZ - Palmtree Panic Present Jap.
LZ - Lost World (Chased By a Rock!"
MZ - Sand Ocean
SLZ - Stardust Speedway Good Future Jap.
SYZ - Collision Chaos Present Jap.
SBZ - Metallic Madness PResent Jap.
Boss - SCD Boss
FZ - Perfect Chaos

If you want, you can compare the LZ, Boss, and FZ music from the original to this to see how the quality's improved. =P I'll put up the instructions for the fix tomorrow, I'm sleepy now, so sorry.