I recently purchased this at an auction, but as I don't even own a PC, I couldn't fully utilize its functions. I'm listing it here in the hopes that someone who can will be able to use it. This is a listing for the main unit only. Operation has been confirmed. 【Versatile Harmony Function】 The QUINTESSENCE HARMONIZER is an effects pedal for adding rich harmonies to your guitar's sound. You can select from a variety of scales and keys, making it easy to create harmonies that match your performance. 【Intuitive Operability】 The KEY, SCALE, MIX, and HARMONY knobs feature a simple and intuitive design, allowing for easy adjustments even during a performance. This makes it easy to use smoothly during live performances. 【High-Quality Sound】 With a true bypass design, the sound quality is not compromised even when the effect is turned off. You can maintain high-quality sound while using the effect only when needed. - Brand: tc electronic - Model Name: QUINTESSENCE HARMONIZER - Function: Harmonizer - Connection Type: Standard Out - True Bypass: TRUE BYPASS - Controls: KEY, SCALE, MIX, HARMONY Thank you for viewing.