Inspired by the sounds in this tutorial, I’m looking for a module that would work similarly to Kilohearts Disperser, or the “diffusion” filter mode in Serum 2. Maybe a phaser with optional modulation and a high number of stages could work–the highest I know of is the Surge phaser with 16 stages. I experimented briefly with saw wave osc → 3 phasers in series → distortion, and did get some interesting results–particularly when the feedback was set to -100%–but that appeared to have more to do with a massive gain spike (like ~40v or something crazy like that) that the negative feedback caused.
This is probably what you want, it was inspired by Disperser. Makes a simple click or trigger into a great kick drum!
For a simple allpass filter you can wire in series, try KRT J. I like to chain a load of those together with feedback and ping it, makes quite organic, woody or metallic tones - a kind of DIY physical modelling.
Thanks for the KRT J reference!
I had been wanting to explore all pass filters for a while now, ever since I saw a video from Jason about the Instruo dapf (Dual All Pass Filter).
But the dapf is not available in VCV. 
The KRT module names are so cryptic, and the communication from the author is so inscrutable, that I long ago gave up on that plugin. My loss - the J seems to work pretty well. I’ll have to give the KRT plugin another chance. Meanwhile, I now have a module with which I can begin to explore the world of all pass filters!
Oh yeah, I forgot to mention. If you want to wire a polyphonic module like KRT J in series, try the Venom Recurse. Assuming you have a mono signal, then a single J with one Recurse gives you up to 16 low pass filters in series. Or the Recurse Stereo gives you up to 32 in series, or 16 if you start with a stereo signal.
Thanks, yep I’ve used that before. Agree with you on the inscrutable names for the KRT collection, I forget what that’s called myself sometimes!
There isn’t a huge choice for allpass so that one is handy. DocB has one too but it seems to act more like a delay.
Another +1 for the KRT “J” allpass. For reasons similar to those above, it’s the one and only KRT module I keep in my personal library. 
Just spotted another option in the announcements thread:
Yeah, I saw that too. That module has additional effects beside selectively shifting the phase of certain frequencies. Perhaps it is more similar to the docB all pass. I need to wrap my head around a vanilla all pass, so I will probably stick to KRT J initially. But Diffuse does look interesting.
Back in July 2024, I asked the good folks at Instruo if there was any chance we might see dapf in VCV:
“… We use VCV a lot in house for teaching, and while It would be cool to model the dåpf into VCV, at the moment we are just far too busy to take on a porting project like the dåpf!”
Maybe one day. 