The Tone City Comp Engine is a smooth, musical compressor inspired by classic OTA (Operational Transconductance Amplifier) designs like the legendary Ross. Built for clarity, versatility, and ultra-low noise, this compact pedal delivers rich dynamic control without sacrificing your tone. With just three essential controls, the Comp Engine makes it easy to dial in everything from subtle sustain to tight, punchy compression—perfect for a wide range of playing styles. Whether you're enhancing clean tones or adding extra presence to your leads, this pedal keeps your sound clear and expressive. Premium components and true bypass switching ensure your signal stays pure when the pedal is off, making the Comp Engine an essential tool for players who demand both tone and precision in one compact package. Please note: This pedal is not compatible with 9V batteries and must be powered using a 9V DC power supply. Classic OTA-style compression inspired by the legendary Ross design Delivers clean, low-noise, and transparent compression Three essential controls for simple and precise adjustment Wide dynamic range suitable for various playing styles Enhances sustain and tightens overall tone High-quality components for reliable performance Compact and pedalboard-friendly design Powered by DC 9V power supply only Compatible with Tone City Substation and TPS Series power supplies True bypass switching for pure signal path