Houston, I have a problem.

I had my POD XT PRO connected to my Mackie Onyx 820i mixer, via the unbalanced analog outs, and everything worked and sounded fine. But I was experimenting the other day with some other connection possibilities — the usb connection, i/o & dig select button, etc, as well as making adjustments on the Onyx. But after a while, I decided to go back to the way I had it connected before with the analog outs.

The problem is now what I'm hearing in the Onyx, is an awful lot of fizz and buzz added into whatever guitar tone I select on the XT, as if the signal is being distorted. And it seems that no matter what buttons or controls on the Onyx are pushed or dialed, I can't get rid of the fizz & buzz. However, when I plug my headphones directly into the XT, everything sounds as it should, perfect: no extraneous fizz or buzz whatsoever.

So, I'm wondering if in my experimentation with the XT if I inadvertently hit some button or made a switch to something (in one of the XT windows that popped up) and is now sending the "wrong" signal to the analog outs? Is it possible that I can hear something in the headphones (when plugged into the XT) that is different from the actual XT output?

If that's the case, how might I correct this problem?

I realize that the fizz & buzz problem might be emanating from the Onyx because, as I said, I made switches there, too. But I'm starting with the XT first, just to make sure the signal I'm hearing in the phones is the signal that is being sent.

If what I hear in the phones is indeed what is being sent to the Onyx, then it will be on to the Onyx to recheck (again) my connections there.

Thanks so much.