The Okko FX Coca Comp is a studio-quality optical compressor and clean boost pedal designed for transparent operation. Unlike traditional VCA-based compressors, it utilizes an optocoupler to provide smooth, natural compression that enhances sustain without squashing the note attack. The circuit is designed as an "upward" compressor, meaning it amplifies quieter subtleties rather than just limiting peaks. The MKII version introduced a passive tone control for warming up or brightening the signal. It features an internal voltage doubler to provide increased headroom and superior dynamic range. The pedal is handmade in Germany with high-grade components for exceptionally low-noise performance.