ART SCL2 Stereo Compressor/Limiter/Gate/ExpanderThe SCL2 is a highly sophisticated and flexible dynamics processor designed for easy operation and great tone. The unit can be adjusted to provide anything from smooth subtle compression to hard limiting. Noise reduction is provided by a fast solid gate or a subtle expander. The Attack and Release functions allow the user to set the general operating range and then automatically adapt to the audio being processed. A full auto mode is also available.