Channel Dynamics Compressor & Gate Introduction Channel Dynamics Compressor & Gate is the rack version of the Dynamics section in Reason’s Main Mixer. The rack version is mainly intended for use in the VST3 plugin version of Reason, since it lacks the Main Mixer. However, you can of course use it wherever you like - also in the stand-alone Reason program. The Channel Dynamics Compressor & Gate device has identical specifications compared to the channel strip version, with the addition of Input Gain and Dry/Wet Mix controls.