sending CC114 with any value above 64 puts the SE into Gate trigger mode, and any value below 64 puts it into clock mode.
sending CC108 has three possible settings which could be relevant too. Int/Clock/Ext modes. They exist somewhere between 0-42, 43-84,85-127 or something like that.
I have no idea if this is the same on the original MB but maybe.
Good luck in any case.