Dr. Expander is a downward Dynamic Range expander/noise gate. Signals falling below the Threshold setting will be downward expanded by the Expand amount up to 200%. This device will increase the dynamic range of audio material thus reducing the noise floor while making the audio more "punchy". With its unique, dual stage integrators Dr. Expander is never "gritty" or harsh. Dr. Expander can be used on mono or stereo channel inserts as well as the master stereo buss insert.