The ULT4 footswitch has four modes indicated by the three LEDs on the left side of the footswitch (no LEDs lit indicates the fourth mode—Tuner Mode). Press the MODE/TUNER button repeatedly to cycle through the modes (press and hold for a shortcut to Tuner Mode). The ULT4 4-button footswitch is for Mode Select, Start/Stop of Backing Tracks and Phrase Samples, Program Select and Tuner Select and has a 1/4 inch jack.