Disabling Music

While no tool exists specifically for MP3 playback on other games besides Sonic 2, having any music of your choice may be difficult, unless of course, you write your own tool or a plugin for one of the emulators to allow such an action.

We can, however, advise methods of working with and altering game sound drivers, as Nineko, Tweaker, andlabs and a vast majority of others to note, have done a lot of research in this department and have proven the ability of porting music from game to game, and even the drivers themselves, we have got to the period now where we're able to place our own designed music in place of what's originally there.

While you won't be able to use or produce any music/sound you want, you're at least provided with two sound chips which do their best to generate realistic enough sounds.

Now, most Sonic games tend to use a provided sound driver known as SMPS, while I don't know the full function and locations to all of them, I can at least provide you with a way to disable the music perminantly, you'll require a hexadecimal editor to do this though:

Sonic 1 (REV 00)

Offset: 00000338
Change "B2 51" to "60 04"
Offset: 00001396
Change "11 C0 F0 0A" to "4E 75 00 00"
Offset: 00071FD2
Change "0C 07 00 88" to "4E 75 00 00"

Sonic 1 (REV 01)

Offset: 00000338
Change "B2 51" to "60 04"
Offset: 0000138E
Change "11 C0 F0 0A" to "4E 75 00 00"
Offset: 00071FD2
Change "0C 07 00 88" to "4E 75 00 00"

Sonic 2 (REV 00)

Offset: 00000338
Change "B2 51" to "60 04"
Offset: 00001352
Change "4A 38 FF E0" to "4E 75 00 00"

Sonic 2 (REV 01)

Offset: 00000344
Change "B2 51" to "60 04"
Offset: 0000135E
Change "4A 38 FF E0" to "4E 75 00 00"

Sonic Crackers

Offset: 00006402
Change "33 FC 01 00 00 A1 11 00" to "4E 75 00 00 00 00 00 00"

Sonic 3

Offset: 000015E2
Change "33 FC 01 00 00 A1 11 00" to "4E 75 00 00 00 00 00 00"

Sonic & Knuckles

Offset: 00001358
Change "33 FC 01 00 00 A1 11 00" to "4E 75 00 00 00 00 00 00"

Sonic 3 & Knuckles (Two parts)

Offset: 00001358
Change "33 FC 01 00 00 A1 11 00" to "4E 75 00 00 00 00 00 00"
Offset: 002015E2
Change "33 FC 01 00 00 A1 11 00" to "4E 75 00 00 00 00 00 00"

Sonic 3D blast, flickies' island

While I was considering looking through the Z80 code, I really couldn't be bothered on my part, so I could only recommend searching for some "00 A0 1C 0A" and changing them to "00 A0 70 00", some may be used for SFX, so I suggest being careful with which ones you change =P

The other Sonic games? Beats me...

 

Not yet. Cinossu's MP3 plugin he included in Retro Channel will eventually support Sonic 1, Sonic 2 and Sonic 3K. Dunno when that's gonna be ready for release, though.

 

Well if you actually go off and download the SAGE demo pack, you can get the mp3tool. In theory if you setup the mp3s, you should be able to run them, specifically Sonic 1 anyway. Good luck

 

I believe only Sonic 1 is fully compatible at the moment, though.

 

Correct me if I am wrong, but OP is simply making a video. He needs to disable the in-game music so that he can play his own tunes over the top - without having to mute the sound effects too. He doesn't want to put his music choices into the game and have them play instead. I'd have thought this would be as simple as replacing the necessary music files with blank ones? Then he can simply play through with sfx only, and dub his own music over the top for the video.

 

This is what I would do, actually. Not sure if he wants to bother with a split disassembly, though. Markey's suggestions can be converted to PAR codes and used directly in Gens instead.

 

Darn, thats the one I want most, Project Chaos in-game is gonna be great!

 

Wait, something like this already exists? Man am I behind, I might check this out infact =O

 

This. Thank you. I've always wanted to know how to disable the music just so I could make videos of levels with different music, but with the sound effects left intact.

This is why S3&K needs the mp3 tool.