The Marshall PEDL-10034 1-Way Footswitch is a replacement single-button footswitch designed for the Marshall 1974X handwired combo amplifier. Connected through the amp’s rear-panel footswitch input, it provides hands-free control over the 1974X’s built-in valve-driven tremolo effect, allowing players to engage or bypass tremolo during performance without returning to the amp. For players replacing a missing or worn original unit, the PEDL-10034 offers simple and reliable control tailored to the vintage-inspired 1974X platform.