I'm doing something wrong. I'm using a backup copy of RB1 to generate the iso. My files are much smaller than what they are replacing. When I try to play the custom track, everything freezes on the song menu page, it won't even preview the song while it rests on it, like it does the other songs on the list. I used one of the chart files converted to .mid from the link above, and followed the directions (I think) for audacity, but using 1.3.7 beta. Anyone have a guess as to what I might be doing wrong? Thanks for this guide--it's a really great tool. Sorry I don't seem to be doing it justice.