I have the Edirol Hypercanvas 32 bit version and I'm surprised that the known bug with the kick drum not responding to velocity changes wasn't fixed on the port to a 64 bit version. but as jazzmammal says all you need to do is change the default in BIAB preferences or if you have exported a track already transpose the dud midi kick drum to the one that works. personally i can't hear the difference between the two in a mix