Dave Smith Instruments SYNTHESIZERS

I have made some cool sequences in combo-mode, but can't figure out 
how to make the settings for the rack to respond correctly to my 
external sequencer.
I want to trigger the sequencer (of the poly rack) so it plays of the 
tunes as when I start the sequencer manually on the rack..is that 
possible?
I can use the keys of my Yamaha RS-7000 to play the sound/sequence of 
the PE, but this doesn't work equally like the played sequence in 
combo-mode.

Does anyone have any tip on how to solve this?

Thanks.