Thanks for replying to my posting, Bryan. Not having the manual myself (my friend does have a manual, but I haven't had a chance to look it over.) I phoned a technical rep. from Roland (Roland manufacturers the Boss Jam Machine) who seemed to know some details about the device. I explained what we were looking to do and he said that the unit was designed as a self-contained device which used only it's own internal styles and did not transmit the necessary chord information via the MIDI connection to trigger styles from an external arranger module. So I guess we can't do what we had hoped to do.
Paul C.