CPU spikes

The MOTU is generating the audio (and handling the MIDI I/O) - hence, the volume cannot be controlled at the computer, other than within Hauptwerk itself. I had to bring the sample sets' volume down quite a bit, since the native controls on the Mac have no effect whatsoever. I must say, the audio is still excellent. To tell you the truth, I think it sounds better than before. When I do get the driver (if ever) I need to carefully review all my settings. I MUST have something set incorrectly.

Sounds like your solution works very well!