The MXR A/B Box allows you to route your instrument's signal to two separate outputs. Use it to switch between amps or run them both at the same time with different effect configurations for a full spatial 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. Routes single instrument signal to two separate amp output paths. Select between two sepa