New finding in sceSasCoreWithMix: the volume is only adjusting the volume of the sound data already in the buffer, not the new sound data generated by sceSasCore.
This could fix missing sound effects.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3144 4ab978e6-3352-0410-996c-0b42db0051c8