Take full control of your Microtubes 900 bass amplifier with the Darkglass Super Intelligent Footswitch. This rugged footswitch features buttons to switch between the Clean, Vintage Microtubes, and Microtubes B3K sections on your amp. A handy Mute button silences your amp for tuning or set breaks. All this in a robust and compact chassis that's just as reliable as your Microtubes 900 amp.