For professional bassists looking for a compressor that increases sustain and accentuates picking and individual notes. Extremely quiet and easy to use. The Blend control adjusts the amount of dry signal mixed with your individual notes, while the Volume control adjusts the output; pressing it reduces the compression and provides a very clean boost. The Attack control regulates how quickly the compressor responds to the pick attack. The Compressor control is the heart of the pedal, allowing you to control the dynamic range, while the Low/Full/Mid switch determines the amount of dry signal frequency. True bypass.