Each official audio mix does the echo in the chasm very differently, too. Adywan’s is a heavily modified version of the 2004 DVD mix, so it’s likely that the echo in Revisited is similar to that.
The original mixes (especially the mono mix) had more of an exaggerated echo effect, while the 1997/2004/2011 mixes have more of a natural effect, to my memory. But I could be mistaken, and Ady might have actually taken the echo effects from a different mix that the 2004. I’d have to compare all the different mixes to be sure which his is closest to.
the echo was exaggerated, but it sounded great coming out of the rear speakers.