Re-Selfbooting Stunt-GP understanding porbs.

[Odity]

Hy,
I have the game Stunt GP it is a CDDA Game.
It is selfboot.
So i have used ISOBuster for extracting the Audio and the Data Tracks.
Then I have 24 Audio Tracks (with the 3 small Tracks for selfbooting)
and the Data Track.
Then i used the Echelon way to make this CD Selfbootable.
I burned the Audio Tracks with CDRWin including the 3 4-sec tracks in the front.
Then i used MSInfo for the LBA. I hacked the 1st_readbin and IP.Bin with this LBA.
I create the Data.iso with the right LBA. Then Ipinset the Ip.bin into the Data.iso. I burned this ISO with CDRWin too.
After this i tried it in my DC, and it booted with no problems. I have Music in the Menus, but not in the Game (in the Race). On the CD i used to extract the Files it worked with music...

What have i done wrong?
Thanks for help
Odity