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It is easy for this to happen. It is easy to fix. You were on the right track. (quick fix)Bring up the second channel that is assigned to your input on the board go into the preamp section and assign it to a different input. (Correct fix)More than likely the channel you are using now was not the original surface channel or someone else intentionally patched 2 surface channels to the same input for parallel processing purposes. To fix it you need to figure out which input your current channel should be patched to and change it. Then bring the other channel fader to the surface to replace the one you are using. Save all your channel setting so you can recall them when you bring the new fader to the surface.