I am using the PSR-530 with Cubase 4.1 for the Mac, and I am having problems with the general midi drum patterns. I can record the drum patterns with the right sounds, then when it plays back, it plays back with the right sounds, then in the middle of the playback, it reverts to the regular general midi sounds, instead of the drum sounds. Through experimentation, I'm relatively sure its a problem on the Yamaha side. Is there something in the set up of the Yamaha I'm missing? Any thoughts would be helpful. Thanks.