The JAMJUM MP-1 is a compact dual-mode expression pedal that lets you switch between wah and volume control in one versatile unit. It features a rugged housing and non-slip tread, making it suitable for both stage and studio use. In wah mode, it delivers expressive filter sweeps, while in volume mode it functions as a smooth audio-level controller — all without requiring any additional power supply. Ideal for players who want a streamlined, space-saving pedal that handles both tone shaping and volume control with ease.