Simply depress and you can use your tuner without being heard onstage. Good idea, but we used the mute primarily for being able to switch basses, using the same cord without having to unplug from the input first. Before going forward I must tell you that detailing every aspect of the 2000RB would be impractical for our purpose. If you're interested, and I think you should be, please read the owners manual or promo packet available to you at any Gallien Kruger dealer. They are clear, concise, well written and don't need retelling here.
Lets move on to our impression of sound and tone.
All of the basses we tried sounded good. This amp has naturally great tone. Sure, we needed to alter the sound to fit different situations. But what was apparent was the tonal flexibility. The E.Q. section was simple, but very effective.