What to connect where?Guitars or Instruments are plugged into the PARRALEL inputs. If 2 instruments are connected, both signals are combined into 1. Connect the A and B outputs to different amplifiers. A/B Amp SwitcherStomping the A/B function switch, selects which channel output is being used (A or B), allowing you to switch freely between two amplifiers. LED lights indicate which channel is active. Y-SplitterStomping the Y-split function switch, splits the signal to both outputs, A and B simultaneously. Gain a unique sound by combining 2 different guitar amps, or light up the stage with the full power of your combined rigs. Reverse FunctionThe switcher can also be used in reverse, using A and B as input channels, allowing the user to hit the A/B switch to select between guitars, or the Y-split to select both. Note that this a completely passive device, and using Y-configurations on certain devices may produce a volume drop. Features Input/Output Connections:  1/4 unbalanced jacks Maximum Switching Current Rating: 3A Switch Type: DPDT Double Pole Double Throw / True Bypass Power Input:  9V DC Battery (used for the LED’s only —   actual switching is operational with no batteries) Battery Life:   up to 140 hours Barely audible low switching noise No bleed-through between channels Case:  Heavy-duty all metal construction Indicators:  2 Green LEDs (Signal path/Mode indication) Dimensions (WxDxH):  3.74 x 2.87 x 1.57 (95 x 73 x 40mm) Variety of Functions: Switches a signal between two different targets (e.g., amp A or B) Directs a signal to two targets simultaneously. Switches between one of two different source signals sent to one target Combines two source signals in parallel switched between two different targets Combines two source signals in parallel directed to two targets simultaneously.