Ed,
You might have a look in the software and softsynths section of this BBS.
I found out there about software called OMB which does accept messages from midiguitars/pedals.

Or look at: http://www.1manband.nl/omb.htm
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76