Hey I made a reverb plugin: https://madronalabs.com/products/aaltoverb
The basic algorithm of this is something that I’ve been playing with for a long time, since I made the yafr~ example for Max/MSP (in 2001 or so?) based on the Dattorro paper that gave away the idea behind one reverb “in the style of Greisinger.” (Lexicon)
My newer take on it is that all the allpass delay lines are smoothly modulatable using an idea proposed in “A Lossless, Click-free, Pitchbend-able Delay Line Loop Interpolation Scheme” (Van Duyne, Jaffe, Scandalis, Stilson, ICMC 1997.) So the size can vary from small to large without clicks, which I won’t claim is unique but I don’t hear most reverbs doing.
I plan to share source code for the basic ideas behind this soon… but not tonight. Meanwhile if you want to support this work and have a use for it please grab a plugin license. Or the T-shirt.