PSX Multi File Converter problem

[Slipknot_335]

I decided to test it on my Digimon Digital Card Battle game, and got alot of results. Alot of them were images and those aren't important for me, but it also found alot of music which was great. I decided to play 1 and heard it was played with the piano. "No big deal, it's just this piece of music" I said to myself, so I tried another one, and another one, 'till I gave up: They were all played on the piano!

How do I get PSX Multi File Converter to give me the actual music? These piano versions sound really bad compared to the real version...