Electro-Harmonix Switchblade Pro Deluxe Switcher
-Switch between two amps or turn them both on at once
-Setup your effects loops to run in series or parallel, control what loops are on and, in series mode, what their order is.
-Multi-instrumentalists can connect up to three instruments into one amplifier
-Mix three instruments together and control the volume of each.
-With its Dry Level control, the Switchblade Pro is great for bass players
-The Switchblade Pro prevents tone-suck when vintage, non-true bypass pedals in its FX loops are disengaged.
-Can provide an adjustable volume boost with up to 6dB of clean gain