This short Ableton walkthrough covers three output-stage controls on the Echo device: the Output knob, the Dry/Wet balance, and the delay mode selector.
The Dry/Wet control sets how much of the original signal comes through versus the delayed signal, which directly shapes whether Echo sits in the background or becomes a defining part of the sound. The mode selector lets you switch between stereo, ping-pong, and mid-side delay, each giving the effect a noticeably different spatial character.