The Darkglass Super Intelligent Footswitch gives you complete control over your Microtubes 900. This footswitch features buttons to switch between the Clean, Vintage Microtubes, and Microtubes B3K sections on your amp. It also comes with a Mute button that silences your amp for tuning or switching basses between songs. All this in a compact yet sturdy chassis that's just as reliable as your Microtubes 900 amp. If you're looking to get the most out of your Microtubes 900, get this footswitch.