The Oxygen is a warm and musical high gain compressor/limiter/noise gate which can also be used for overdrive and distortion.  The Oxygen compressor puts many features only found on high end studio compressors into a stompbox format, not to mention adding some features not found on any stompbox compressor.  The Oxygen is designed from the ground up to be very flexible and transparent with the ability to add more warmth to your signal through the use of "tape saturation" like signal distortion.  The Oxygen can also be used as a hgih gain overdrive and can achieve some incredible sustain.