I have an IWILL XP333-R motherboard that has an onboard CMEDIA CMI8738
MX audio controller. I also have the IWILL SuperAudio bracket that
supplies coaxial and optical S/PDIF connectivity to the motherboard.
Motherboard web site:
http://www.iwillusa.com/products/ProductDetail.asp?vID=25&CID=93#

I'm running WinXP with the latest patches and drivers available from
Microsoft. I have verified that the CMEDIA chip is not sharing an IRQ
with another device. My problem is that when I attempt to record
S/PDIF from my external DAT deck via a coaxial cable that I ended up
crackle in the .WAV file. The music can be heard but the crackle is
constant.

Any suggestions would be appreciated.