The One Control Gecko (Mark I) is a compact MIDI program change controller designed to streamline preset management for MIDI-enabled guitar effects. It features a simple interface with three footswitches—Up, Down, and OK—allowing users to scroll through and engage specific MIDI patches. The circuit is designed to send Program Change (PC) messages on MIDI channel 1 across a range of 0–127. It offers two primary operational modes: a "Direct" mode for real-time scrolling and a "Preset" mode for storing favorite patches. The unit includes a large, high-visibility digital display to indicate current program numbers. This pedal is specifically engineered for a small pedalboard footprint while maintaining high structural durability.