The MXR A/B Box allows you to route your instruments signal to two separate output amp paths or run them both at the same time with different effect configurations so you can find your ultimate sound.
Use the Thru jack to connect to a tuner amp or other device that you want to receive a constant signal. The MXR A/B Box comes in a heavy-duty die-cast housing with high quality jacks and switches. Features/Specifications: Routes single instrument input signal to two separate output amp paths Select between two separate signal paths or run both simultaneously MXR Guitar-and-Bass K3L
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MXR A/B Box Line Selector for Guitar Effects