Michael,

Let's go to Options - Preferences - RealTracks.

Is "Allow Auto-RealTracks substitution based on tempo" checked?

Also, what's selected as the Tempo/Pitch Stretching Quality?

Also, if you switch to your computer's onboard soundcard's MME driver, does the problem still occur? This isn't meant to be a permanent solution, just a test to see if the issue has to do with the Delta's driver.

Thanks
Kent
PG Music