Hi Ben, Gavin here again. I am using the 1A6 build with my Jaguar. Had a couple of bars of 4/4 and just through in some drums. No sound was heard when putting them in. I tried playing (looping playback) them back and again got nothing. It appeared like it was playing. The Stop button appeared and got weird highlights on the actual bars, moving in time.. I had to Force quit, after the spinning circle showed up, the Stop button did not stop the program. I restarted the imac. I have tried it again again no sound when putting in the drums, no sound is playing back, either. The play button appeared gray then after a couple of seconds it played, no sound though. I pressed the Stop button, the spinning circle showed up, but it stopped. I tried the 1A4 build again and everything seems normal.. I have been using a couple of Phil's kits, also. Having troubles with the icons... Happy holidays, (I had to work to 4 am on Xmas eve and 1 am on New year's) Later, Gavin.