Question. So are you able to copy these TAKE01.WAV files into the A, B, C, D folder directories? I can't seem to make it work. If I have the files in the Audio folder and I can sort through them fine. But If I move them to the A, B, C, D folders to organize them, the Casio says "No File". And sadly, the manual doesn't say what format they should be in? Is it looking for Midi files??