This rack mount dual channel dynamic processor includes Compressor/Limiter, Expander/Gate, and adjustable enhancer. It also has Automatic Envelope Generator. In that mode the processor constantly adjusts the compressor’s attack and release times based on input signal. Manual adjustment times are also facilitated. This unit is in excellent condition, works great in a live sound or studio application. It includes the original manual from the manufacturer. If the ad is up it is still available.