Many Thanks Robh - that's really helpful. I'm pretty good with BIAB, but new to RB. It's re-assuring to know it really is the software, not me ! It would be great if RB could be tweaked to work seamlessly with AD, but I still find AD a great add-on. The only significant problem I've found is that to listen to a midi file, you have to drag it into RB, rather than using the 'Play' function within AD. I've always been a RT-only BIAB-user, but AD has greatly increased the variety of usable drums sounds I have available.