Instantly switch between two inputs or two outputs, or to use two inputs or two outputs simultaneously.Alternate between two different amps or amp channels; or quickly switch between two guitars going into one amp.In A or B Mode, the footswitch is used to select either Input/Output A or Input/Output B. In Y (A+B) Mode, both Input/Output A and Input/Output B are in use simultaneously, and the footswitch is inactive.
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