Hand built in Denmark, the Comp Nova guitar effects pedal is easy to use and delivers uncolored sound with awesome clarity, detail, and dynamics, even at extreme compression levels. It's designed for guitarists who want to thicken up and smooth their tone and who crave that much sought-after "chime." Very subtle and transparent even at full sustain. Great for blues and jazz. Controls include an Attack knob which adjusts both attack and threshold, plus Compression and Volume knobs. (The Volume knob has unity gain in the 12 o'clock position and delivers a 3dB boost at the maximum setting.) 9V battery operation.