Sonic and Sega Retro Message Board: Eviltaco64 - Viewing Profile - Sonic and Sega Retro Message Board

Hello, Retro!

I made a topic on this website a few years ago about changing the Sonic CD soundtrack in Sonic Gems Collection for PS2. Having revisited my own steps and doing some new research on the matter when trying to run my old ISO on real hardware, it seems that there are a few things I should've been more clear on the last time:

http://atriumsx.blog...c-cd-gcps2.html

I'm only linking to my blog because I don't feel like re-formatting the article for a quote box. The information is anyone's for the taking, and I encourage the talent of this website to add to it in any significant way they can! There's something in me that wants to swap out a few of the roms found in Gems for some of the Mega Collection roms to make the best re-hashed compilation of Sonic compilations that's ever graced 6th-gen platforms (well, either that or disable the time limit in the demo roms). :P

Looking at the code of the master ISO, it also looks like several parts of Sonic CD load like executables too (considering it was a PC port, at least).

Good luck to anyone that might actually go to the extent of modifying and repacking soniccdu.cvm! I haven't tested this in years, but as far as I know, it shouldn't be too difficult to circumvent write-protection and data padding for both GC and PS2 at this point. You guys probably know more about that than I do!

- Eviltaco64

It's a very simple hex edit, really.

Just open your copy of Sonic Gems Collection with a hex editor and search for BGM_US (I believe you search twice) or just scroll down to line 1353439A. Replace "US" with "JP" so it plays the Japanese music:



I tested it in PCSX2 after the hex edit and it played the Japanese soundtrack!

Do note that it takes a while to save as the .iso is roughly 1.8 GB.

Thanks for reading,
Eviltaco64

I remember getting one for answering some question right at school back in the 90s.

Hello, Sonic Retro, I haven't really posted here (although I've lurked since '05), and I can see that this is one of the best places to get hacking advice

I recently found a copy of the PS2 version of Sonic Gems Collection in pieces that I had to download off Rapidshare on a Turkish website.

I read that it had both the American and Japanese soundtrack for Sonic CD, and, after looking in SONICCD.CVM, realized this was true (BGM_US.AFS and BGM_JP.AFS). I extracted SONICCD.CVM from the .ISO and the .AFS files from SONICCD.CVM. I then used afs_extract.exe to extract the .ADX files from BGM_JP.AFS and renamed all the BGM_JP_XX.ADX files to BGM_US_XX.ADX. After repacking the renamed files into a new BGM_US.AFS, I made a copy of the original .ISO and put everything back in it's place. Unfortunately, it wouldnt boot in PCSX2 (the original .iso would, and Im only using pcsx2 for testing purposes). It kept saying SYSTEM.CNF WAS NOT FOUND (while it is there, Im guessing the LBA number has changed).

Can someone please help me?

Thanks in advance