Just got it.

Only thing I can think of is a simple trigger to MIDI device. Roland can't trigger from FC-7.

But also possibly you could check out Roland's MIDI controller pedals like the FC300 and see if the pedals can send a MIDI note on a particular channel (plus there are a bunch of other things you can do with MIDI PC#'s for control).

How about...
http://www.zzounds.com/item--ROLTMC6 Roland TMC6
Or a http://www.zzounds.com/item--ALETRIGGERIO


All cheaper than a PK5...