The Markbass MoMark M2VLFM bass master module features the VLE filter, line out level control, a footswitch input for changing channels and muting your signal, and the bi-band limiter. The Markbass MoMark bass module's footswitch allows you to change between channels (if used with the S2 preamp module and/or EQS4 EQ module) or mute both channels, useful for changing instruments during a performance, or tuning in silence when you have a tuner connected to the tuner output.