Ok, so, I've cleaned up both the verbs abstractions. And fixed a bunch of errors I wasnt aware about. Took going through the guts of all to discover all my sloppyness.
- Added one preset
- Fixed delay time calculation in the [delay~] abstraction
- Reduced sends and throws etc (see later discussion)
- Changed [vline~] to [line~]
- Fixed a bug with the control subpatch not sending correct gain messages for the APNs
- Changed se S control from binary to "analogue"
- Added pseudorandom seeding (using $0) for all delay modulation
- Using the a lot of the same abstractions, a lot of the same changes apply. Basicially the APNs and below.
- added a missing abstraction which rendered the patch useless. The [xfade~] providing crossfade between natural verb and beefcake. I'm sure the smart ones of you made one up on the fly.
Now, about reducing sends/receives or throw/catches. The signal flow in jVerbs matrix go like this: https://imgur.com/a/cE3b0gi
If I substitute the receives and throws for direct lines I get "DSP loop detected" error messages. I suspect I can do away with that by putting the delreads at the junction outputs outside their abstractions, but I'm too tired to try now.
Oh, and I get this error message whenever I open the jverbdemo patch: "$2: argument number out of range". I've not been able to locate the error...
For those interested in the jVerb algortihm, I'll try to elaborate on the design. First of all you need to wrap your head around the idea of the Kelly-Lochbaum scattering junction. I think there's even an object in extended modelling it. My own version is highly modified, but I'll get to that later. Here's the primer on KL-junctions: https://ccrma.stanford.edu/~jos/pasp/Kelly_Lochbaum_Scattering_Junctions.html
As you can see from my flow diagram above, that is the primary building block in jVerb. The second one is Schroeder allpass nests, which also form the essential guts of Schroom.. Neat diagram + discussion can be found here: https://valhalladsp.com/2009/05/30/schroeder-reverbs-the-forgotten-algorithm/
The things not explained in my ms-paint flow chart are the stuff I added to jVerb in order to get rid of metallic ringing and out of control feedback. You can still tweak the patch to do both if that's your thing.
First of all, each allpass nest has a slowmo random modulator on the outer delay loop, with a low amplitude (300 ms, 11 samples).
Second all junctions are provided with a fixed delay plus a randomly modulated delay on each output.
This is all to avoid metallic ringing.
Third, there is a gain control on the inlet of each junction. This is pretty essential in preventing nasty build ups. If you play around with it you'll see that the junction gain is what saves your headphones (and ears).
Finally, there's a cross fade function between the two inlets of each junction. This pretty much destroys the original equation, but can produce some very interesting results.
The latter two are controllable.
You might wanna try adding some filters to the chain or constructing your very own matrix of junctions and nests.
If I spend more time on jVerb, it will be adding delay tuning like Schroom has and maybe optional individual controls for each junction... Dunno.
Post your own mods if you like