The Source Audio Toolbox Tap Tempo Switch SA164 is a straightforward footswitch that enhances the functionality of each One Series pedal in the Source Audio lineup. It provides instant tap tempo control for modulation rates on the Vertigo Tremolo, Lunar Phaser, Gemini Chorus, and Mercury Flanger, as well as delay times on the Nemesis Delay.

Additionally, the Tap Tempo enables external preset navigation on the Nemesis Delay, switches between distortion engines on the L.A. Lady Overdrive, Kingmaker Fuzz, and AfterShock Bass Distortion, and facilitates virtual knob adjustments on all One Series pedals. Moreover, the switch includes a standard 1/4" output for compatibility with third-party products, featuring a normally open (NO), single pull/single throw (SPST) configuration.