Interesting background here on the Diffchorus algorithm, from some people who should know:

https://www.thegearpage.net/board/index.php?threads/what-does-the-structure-of-an-eventide-diffchorus-look-like.1792534/#post-25636521

I don’t know how much of this translates to the Blackhole version in the H9/Space, but this may explain why I like the modulation so much; even in lighter doses.

“Each of the allpass delays seems to have its own slow random modulation of the delay length”