Pulling out the lead from your guitar while your amp is on to change guitars creates that horrible "popping" sound. use this sweet little box, hook up both guitars, one switch, and you'll never need to worry about popping again. And remember, all our pedals our hard metal, Made for the stage!. This can be used for 2 guitars into 1 amp, or 1 guitar into 2 amps (and lot of other combinations) . Please note this is not an ABY pedal so you can't run both amps at the one time.