Micro perfection sound just a bit smaller Want a mirror image of your tone, only louder? This is it. The Katana Boost is also a fat, harmonically rich boost, just pull out on the volume knob and stretch your imagination with overdriven tone! You can keep it on all the time to push your amp harder, or as an occasional boost to cut through the mix. Obsessed with cleanest, most enjoyable tone boosted? Well, Before other people started using Blue LED’s and non-diode clipping stages, there was the TMB and Katana…. Cascading FET stages do the tube-amp-thing like nothing else! The Katana circuit is Robert Keeley’s first guitar effect design for Keeley Electronics.