I used Romi's addmusic to insert custom music, but when I enter a level with custom music, it freezes at "Mario Start". Why is it doing this?
The SPCs can be played with a SPC player. It allows you to listen to the port before inserting it.
Anyway, is it clearly stated that the N-SPC patch isn't needed? What is/are the song(s)?
EDIT: LEVEL U-*shot*