‘‘The Cathedral is a digital reverb pedal with seven different types of reverb plus digital echo, all of which work in true stereo.”
that’s from the manual
It’s rather subtle, it adds a stereo spacial sound that you can’t get in mono. The Blend, and Reverb time nobs seem the most effected in stereo The blend cranked up really creates the “CATHEDRAL” sound, where as tuned lower you get more of your classic reverb tone. also the infinite mode dose some thing really weird to the stereo, especially when you keep playing with the button held down.