Greg-

I had a similar problem with an Asus mobo and a Layla 20 card.

Although I thought that I had disabled the onboard sound...I had moved the jumpers...I found that I:

-Didn't set them correctly at first.
-Further had to disable the audio system in the bios.
-Something else that I can't remember...but I don't think it was important...it was perhaps turning off Windows sound schemes....something like that....

Also, make certain that the drivers are up to date and that the chipset on the mobo is not in conflict with the Echo card.

Echo cards can be particular...that chipset info is very important. Check the Echo website for details.

Best of luck-

Kev.

Kev,
Thanks for your help and advice. Last night, as a last-ditch effort
to solve my problems, I went into the bios and disabled all USB
related support and then when windows booted up removed all drivers for USB to PCI bridge and anything having to do with USB.
I then went into Adobe Audition, opened a session with about 20 tracks, selected a good size range and looped it. It played flawlessly for 30 minutes before I stopped it.

Apparently, the USB functions/drivers were interfering with my sound card/driver(which is PCI), so I think major troubles are over, of course, anybody who uses a computer for digital audio knows that "trouble" is it's middle name.

Thanks again
GC