Am I right when I read your message as saying that you composed a piece of music, and then tried to convert them into modules by using that music as a sample? If that is the case, then you're basically doing it wrong. Modules can be small because the samples you include are used to compose music with; the samples are not the music itself. If you want to use your wave or MP3 music as JJ2 background music, you're better off using JJ2+'s improved music support and including an MP3 file.