This 2-way latching footswitch for MG50FX models will allow you to quickly switch between clean:crunch mode and overdrive so you can quickly adapt your sound.
Marshall PEDL-90010 Double Footswitch - 'Clean:Crunch/Overdrive' Pedal NEW
Marshall 4-Button Footswitch for Guitar Amplifier, Foot Controller PEDL-90008
Marshall 2-Button Footswitch PEDL-00009 Channel / DFX for MG Series Amplifiers
Marshall PEDL-90012 Footswitch Pedal
Marshall single Channel Footswitch with led and 5m Cable.