A volume swell can change the feel of a phrase, and the Singular Sound Xpresso volume and expression pedal puts that control underfoot. Its rocker lets players raise or lower audio levels without interrupting their playing, while a dedicated expression output controls parameters on compatible effects and devices. Dual stereo audio inputs and outputs support flexible routing, including two separate stereo sources in TRS mode or two mono sources in mono mode. With sturdy all-metal construction and passive operation that requires no external power, the Singular Sound Xpresso brings hands-free volume and expression control to pedalboards and performance setups.