The Collider Delay+Reverb's "Unlock" feature allows you to stack two delays effects and run them simultaneously. By default the Collider is a studio quality delay and reverb effect with the ability to mix and match any of the pedal's 5 delay effects and 7 reverb effects. The Unlock feature makes it possible to create dual delay or dual reverb presets. This video gives a basic overview of the Collider's front panel controls as well as instructions on creating dual delay or reverb presets, and changing the routing options from Dual Cascade, to Dual Parallel or Dual Parallel with a left/right stereo split.
Learn more about the Collider Delay+Reverb - https://www.sourceaudio.net/collider_delay_reverb.html