So my hunch was correct it is in the sfo! Now time to do some experimenting...
Does anybody know where I can find this ps3sys.exe?
Hellcat's version of this doesn't seem to support the xmb soundtrack option
I found the ps3 package tool 0.5 recently posted here has an sfo editor that lets you edit this, however, even after I checkmarked the xmb background music box in the sfo, in Fallout 3, it still says game does not support custom soundtracks when I try to launch 1 from the the xmb.
I double check the sfo, and the changes I made held, and I did make changes to the 1 from the gamez dir not the game dir, and the remoteplay change worked fine, so im assuming perhaps this feature either does not truly work yet, or theres a little more to it, or perhaps it just wont work for every game... Further testing needs to be done. Any Ideas?