Few Problems with Computer as Source

When using other transports to play CD's (or my built-in CD drive) the annoying chirping sound does not occur. Music does play tho, just got a weird chirp... And it seem to happen randomly, it does not seem to be in a repeating pattern (or a pattern i can identify)...

I'm starting the source of the problem is because the files are on external drive (clock/sync/jitter issue)... maybe if i upgrade the external drive to something w/ more than 2MB of cache the problem would be gone?... or one w/ FireWire? Maybe try another USB cable.

Does anyone out there have the same problem?

Maybe I should give PS Audio Memory Transport a try once it's out...

Sounds like "lack of sync lock" between the source (toslink output) and the DAC. I've heard what sounds like a similar sound between a regular CD transport and DAC too. Do you have the ability to try a different "transport" like a CD player or DVD player connected to the DAC via toslink? If so and you don't experience the issue, you may have a configuration issue with the sound card or it may be defective.

When you hear the sound do you also hear music, or is it just the noise?

TIC