I've put together a compilation cartridge with all the tracks Lauren and i will be working on for the hidden village show in a week and a half. This has been done with the java program LSDManager (by Kotlinksi).
Wow! I have used it before, if only to test it out - but it is a fantastic idea with great results. What you can do is take songs from an lsdj sram save file (.sav) and export them as individual files (.lsdsng). Individual songs can then be recombined in different orders etc to make up a new .sav, which can be flashed onto a cart.