Operation is simple: left to center on the Blend knob is just echo, to the right of center it adds modulation to the echo repeats. A push button selects Chorus or Vibrato for modulation type. The other two knobs are simply Delay time and Feedback. (The DM will also self oscillate when the Feedback knob is maxed similar to an analog pedal). We know you will have as much fun making music with the Dream Mender as we had creating it!