A simple solution for you (since you don't have a FC-7 pedal) may be to use a pedal plugged in to the pedal port on the back of the BK7m. It can be set to function as perf. next or performance next. If you do this, but still need a damper, plug the damper pedal into your A800-Pro (and an expression pedal for that matter too if needed.) They will transit the signal straight through to the BK7m in addition to what is plugged into the BK7m directly.
I just took delivery of another FC7 pedal for myself which I purchased on ebay for £17 + postage. It was too good to be true, because it has had a different plug fitted (6 pin rather than 8 pin) which looks like it has been adapted to work on a Korg EC5 socket. I'm slightly annoyed with myself, because I wanted another to use with my G70 seperately. Hummmphhhh!
Guys, I'll come back to you on your USB questions shortly.... I am just trying it out now.
Edited by Sweentech1 (05/05/1110:00 AM) Edit Reason: typo
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Roland G-70, FP-4, BK-7m, SonicCell, KC-350 x 2, DS-5 x 2, A300-Pro, Sonar X1 PE, BR1600CD Yamaha HX-1 System 1, KA-20x2