Xotic AC Plus
The AC Plus is actually two stackable channels – a gain booster and a preamp channel – but it goes a lot further than other similar two-in-one effects since it offers more than just gain and level controls and a bass/midrange lift at the preamp stage. You can also switch between hard and soft clipping on the A channel to go from a crisp, clean boost to smooth, warm overdrive, fine-tunable with the three-band EQ. By adding the B channel and adjusting the second gain stage, you can push the overdrive a little bit further or make it sound like a really fat scream. Much cooler though is the fact that you can switch the direction of the stacked channels, from A>B to B>A, and change the dynamics of the gain structure significantly. This lets you coax an assortment of overdrive flavors from a single box, loose and fuzzy to tight and super-crunchy, all with huge sustain and no extra coloring of your tone.