there is a particular track in sonic 3: the theme for HYDROCITY, ACT 2.
i noticed the lead melody has a certain reverb to it that reinforces the feel of being in an enclosed space full of water and walls.
Does that reverb come from triggering two 4-OP channels with the same parameters and over 50ms apart or is there some kind of special technique or feature that allows reverb over a single channel?

inb4 a botbr ragequit

I would assume it's using two channels -- could be using two different instruments tho or two different pitches or both.

Regular fakeverb, two channels, one played slightly after another and with a detune or slightly different sound.