The API 225L Compressor is ideal for all studio, live sound and broadcast applications. Regardless of the threshold or ratio settings, the output level always remains at unity. This unique feature allows real-time adjustments without changing the output level. Both "feed forward" (new) and "feed back" (old) gain reduction methods are selectable on the front panel. There also is a SOFT or HARD selector for either an "over easy" compression resulting in a very natural, uncompressed sound or a typical sharp knee type that has a much more severe limiting effect. The 225L is designed for individual channel use or two units can be combined for Stereo applications via a rear access pin. The 225L also has a side chain input for the detector amplifier.