Dave Smith Instruments SYNTHESIZERS

Hi there,
(i guess this question was already discussed earlier, but i didnt find
a clean answer):
is it possible to make PGM changes in Combo Mode (not the Combo
itself, only one of the Four Voices) via midi by an external sequencer?
or do i have to build up my combos individually (every voice in
program mode)?
are there any solutions?
links welcome =)
thanx