Having trouble with The Audio in Psx Backups!!!

[yankee]

I have made about 5 backups now and yesterday my brother came over and played some with me, he then told me (we were playing Twisted Metal 4) that there should be music playing, the opening screen and video has music but once you actually ####t playing there is no music, further more if you puse the game and go down to music you can't hear anything my brother says you sould be able to hear music, i guess thats were you turn the volume up or down, well could somebody please tell me if its the burning process itself or is it my game enhancer? my brother says its my game enhancer but i would like to get everyones opionion. ps, this also happens with the game sled storm, the opening video works fine but when the ####t and options screen comes on you can't hear the music ####t to boot up then just dies off! hope someone can help me with this!!