Alesis 3630 Compressor Dynamics Processor Two independent full-featured compressor/ limiters 3630 offers Ratio, Threshold, Attack and Decay controls to customize its compression response for even the toughest signals. RMS and Peak compression styles, plus Hard and Soft Knee dynamic curves Two fully independent gates with threshold and rate controls sidechain for keying or ducking effects Two independent full-featured compressor/ limiters 3630 offers Ratio, Threshold, Attack and Decay controls to customize its compression response for even the toughest signals. RMS and Peak compression styles, plus Hard and Soft Knee dynamic curves Two fully independent gates with threshold and rate controls