WOW! Thanks for the quick reply. MME works. I did a start/stop 200 times without incident (other than my wrist getting sore). It's been so long since I used MME I didn't really regard it as a viable option.

As you can tell by my setup latency was a major concern (PCI interface, fast processor, RAM - I built the machine over 2 years ago, though). I read that the WDM KMixer adds 20-30ms of latency, the effect of which, I expect, gets compounded when using many channels & tracks. As I don't really expect PowerTracks to support WDM KS, getting the ASIO to work would be preferable, particularly since I am considering other PG Music products.

I've used M-Audio's 5057 & 5069 drivers before going to 5074. All had the same problem, although I do like the control panel in the last two better, as it makes it easier to monitor the hardware.