How to fix custom song glitches on emlators.

Well, if anyone finds the way, there might be the chance of making songs in a real cheap way, in my case i'd fill that space with at least one of each main type of instruments found among the ones that start from 0x20, then the other slots would be filled with instuments that you can't find in FF6, like orchestra beat(don't remember the name exactly ) one of the most desired is a Grand Piano instrument, since FF6 instruments greatest weakness is piano.