Volume control for musical instruments and high-impedance sources. Expression pedal function for keyboard modulation control. It features heavy-duty aluminum die-cast body, ultra-smooth pedal movement for utmost control, rubberized pedal surface for non-slip action and comfort and adjustable minimum volume setting. It is equipped independent tuner output connector for silent tuning, fully adjustable pedal feel and high-quality VR (Variable Resistor) for utmost reliability and smooth audio performance.