The DS201 is a sophisticated dual channel noise gate incorporating a number of features pioneered by Drawmer, which are invaluable to the sound engineer, and not found on conventional noise gates. variable high pass and low pass filters for "frequency conscious" gating comprehensive envelope control, attack, hold, decay, and range key input for external triggering "key listen" facility extremely fast attack time, to preserve the natural attack of the sound balanced inputs and outputs stereo linkable can be used for "Gating" or "Ducking" high audio specification