You dont have to download Dave Mirra ISO again: use your old one, just get the Dave Mirra Patch/Fix from megagames website. It was pretty easy I just followed echelon's selfboot method and it worked. Finally I can change the music manually. There are still some bugs, but no doubt its better than before.
P.S. With Dave Mirra- probably every other game with CDDA you can replace the original wav's with your own songs
Of course the ingame menu will still show the original song names, but as long as it works its fine by me.