RFM REVERB contains 2 separate reverb units with modulatable Decay, Mix, Feedback and Cross between channels. For fun there is also some delay in there, but not your average delay, but just as an extra effect sound. Although RFM REVERB contains 2 reverbs, nothing stands in your way of inputting a stereo signal into IN1 and IN2. In that case you have both channels to handle your channels differently. The CROSS dials give you the option to send output from one channel in to the other.