Connect this 2-button footswitch to your Mustang amplifier (included with the Mustang III, optional for the Mustang IV & V) to enable remote multi-function foot control. Use the Utility menus to assign one of the following functions to the 2-button footswitch: Select presets (up/down) Select Quick Access presets (QA1/QA2) Bypass effects (various combinations) Set TAP interval Six-button footswitch options Plug both a 4-button and a 2-button footswitch into your Mustang amplifier to expand your remote control options. By assigning different functions to each footswitch you can create more than a dozen different foot control combinations. For example, you could assign Quick Access presets to the 4-button footswitch and Up/Down presets to the 2-button footswitch. Or you could bypass effects with the 4-button footswitch and select presets with the 2-button footswitch. The choice is up to you.