I've just got a CD full of X68000 games

AFAIK, there are quite a good bunch of X68k games which have MT-32 support. I've tried some of them that, in theory (according to the Wikipedia's MT-32 game support list) are MT-32 compatible. The problem is that, in most of them, I just cannot manage how to "activate" the midi support, and they play the music using the internal sound generator. Is there some kind of "standard procedure", or it depends on each individual game? the "F1" trick works with Atomic Robo Kid, but not in many others. Does someone know more about X68k MT-32 support?
Thanks!