Hayden Dr. Green Booster This is a clean booster from Hayden, known for their guitar amplifiers. It's the Dr. Green Booster. It has two designs: High Boost and Full Boost. High Boost: Boosts high frequencies (Treble Booster) * If you set "high" to zero... Full Boost: The sensation is that the mid and high-mid ranges increase, with no increase in bass. It's recommended to use it clean when tuning down a half step, without distortion. It was for backup, so it was used indoors and not stepped on with shoes. Please consider it. There is no scratchiness, but please understand that it is a used item. If you have a desired price, please let me know, and I will consider it. #SparkBooster #RCBooster