The Dynami Vise is a natural, transparent sounding compressor that preserves your tone while boosting low level nuances of your playing by up to 20dB. Its very low noise floor wont add extra hum or hiss to your tone, as some other vintage compressor pedal designs do.The Dynami Vise excels as an always on effect, due to its transparant qualities- so much so that youre bound to miss it when its off. Its ability to operate at 18v makes it great for bass as well as guitar. This is the comp that will convert some of the I dont like compressors players.Runs on 9v or up to 18v for more headroom.Controls:More (Volume), Smoosh (Compression) and True Bypass footswitch.