**This kind of problem must be isolated**

*It could be as simple as corroded audio connectors at the SD20's ouput, or a bad cable. Substitute known good cables one at a time and test. Use a wee shot of a good electrical contact spray such as Deoxit on the plugs and jacks to clean them.

*Connect the SD20 to another known good audio setup temporarily to listen to it. This could be as simple as your home stereo's AUX input.

*Listen carefully to the SD20's headphone jack output using headphones. See if the distortion is there as well.

*Try connecting the SD20 to different inputs on the mixer and see if the problem persists or not.

*Connect a CD player's output to the same inputs on the mixer and play some CDs that have about the same content as your BiaB and gigging files do. Again, see if the distortion persists or goes away.


--Mac

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