The Kuassa Efektor CP3603 Compressor unit is the perfect addition to the Efektor series virtual pedalboard and represents many other compressor pedals in a straightforward package. A compressor will suppress the loudest part of incoming audio signal, based on the specified threshold. Following the ‘compression’, it will increase the softer signal, narrowing the dynamic range thus delivers a more consistent overall level. And please take note, although this unit is designed specifically for guitar and bass players, you can also use it on any other instruments as well. There are three types of compression styles in this unit. Voltage Controlled Amplification is fast, modern and clean. Field Effect Transition is known for its aggressive behavior and adds distinct color to the sound. OPTO, short for Optical, has the slowest reaction but provides more character and tightness.