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In article writes:

My dbx 386 mic pre has S/PDIF out as well as analog out.
I can take the analog output and go into my A/D card
(Terratec EWS 88MT). This way the problem doesn't occur.

But if I connect the S/PDIF output of the mic pre
with the S/PDIF in of the A/D card, I hear that noise.

So you're always monitoring the analog output of the Terratec card,
sometimes fed from its analog input, sometimes fed from the digital
input. But the examples you've been posting have all been recorded
through the same path, so it's not surprising that they sound OK
(since they sound OK under some conditions at your studio). If you
wanted to illustrate what happens when you monitor the digital output
of your preamp through the D/A converter in your sound card, you'd
have to re-record the analog output of your sound card.

Given the situation, I'd say you have a clocking problem. Check the
Terratec driver control panel and, when you're using the digital
input, make sure it's getting its word clock from the digital input,
and not the internal clock. I'll bet that's your problem.

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