Have you tried resetting the channel levels back to the default setting and see if this may 'clear' the problem?
[image|771735]
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=== Update (03/14/2016) ===
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Hi dawaymusic,
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Try 'resetting' the system. If it doesn't restore the function after the first attempt do it 4 more times in a row before you try it again. (Have read that it can sometimes take 4-5 consecutive resets to fully restore the system).
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Be aware that it will reset all ''your'' settings to their default values, so you may have to set it up to how you had it all over again.