I had the same issue! I ended up programming the FCB to just send a midi note message for each button as they're momentary. I believe unless you get the 'uno' upgrade EPROM for th FCB, the messages it sends are latching for CC's etc. I'm not 100% sure on that though. As for the sending multiple messages, by default I think the FCB sends CC's out for the two expression pedals, so you may need to switch those off from the FCB, which is easily done. That's what I did anyway and it's been working fine since!