USES: 1. Connect your guitar to Input on the ABY Landtone Pedal, connect amp A to A on the ABY Landtone Pedal and connect amp B to B on the ABY Landtone Pedal. Step on the A+B switch at anytime to combine both amps. On models with leds, when you are in A+B mode, the previous A or B channel's led that you were on will remain lit to let you know what you will resume back to when you deselect A+B . You can also preselect A or B when in A+B mode. 2.Connect your guitar to the Input on the ABY Ladntone Pedal, connect your amp to A on the ABY Landtone Pedal and connect your tuner to B on the ABY Landtone Pedal. You can make any tuner true bypass capable this way. Select A+B to tune while you are playing. 3.Connect one guitar to A on the ABY Landtone Pedal and one to B on the ABY Landtone Pedal and connect your amp to In on the ABY Landtone Pedal 1Use style 9v 2.mm adapter (NOT INCLUDED) for LED power only. 2.Will work without power minus LED indication. Our LED circuits does not screw with your tone 3.Split between your amps or combine the two anytime 4.Use for silent tuning and/or feed your tuner while playing 5.Dimensions 112 x 61 x 31mm UPC 709046306120 Voltage 9 Volts Brand Name LANDTONE Manufacturer LANDTONE Power Source Adapter Controls Type Footswitch Signal Format Analog Item Dimensions 1.22 x 24.02 x 1.22 inches Hardware Interface HP-HSC