This can essentially be closed; I figured it out. The songs.dta file had two extra lines in each of the Rock Band 1 songs that were causing the issue, 1 referencing a “Song location 2” and 1 referencing that it had been exported. Removing those 2 lines from those song entries cause the song to load/play fine.
Only thing is the animations are a bit off and I imagine this still has something to do with the milo files being absent, but it’s not an overly huge deal.
