One other thing to check: do you have any DC offset on the input to the
preamp?

The Touch has output caps, but they didn't hook them up right, there is
no bias voltage across them. Amazingly enough this actually works pretty
good as long as the input impedance is not too low. BUT if the preamp
has a volt or two the wrong way it will actively unbias the cap which
will cause all kinds of problems. 

For other devices that actually implemented their output caps correctly
a volt or two of voltage on the preamp input won't be enough to unbias
them. 

Just a thought.

John S.


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