Create an adequate pure Csound implementation of algorithmic reverb

[gogins]

The idea is to implement a studio quality, non-convoluton based reverb in pure Csound code. A very good overview from Sean Costello.

The motivation for this issue is my dissatisfaction with the way the Sean Costello reverbs in Csound handle stereo -- otherwise they are quite good.

• [ ] Jon Dattoro's reverb .
• [ ] Jon Christopher Nelson's MVerb Cabbage VST plugin (Csound code internally). Note: this does not appear to implement Dattoro's "tank" or "plate" reverb.
• [ ] My own port of Nelson's Cabbage plugin to a C++ plugin Csound opcode. This can sound very good, but not always, and is very compute-intensive.
• [ ] A JavaScript implementation of the Dattoro reverb for WebAudio.
• [ ] A C implementation "closely following" Dattoro's paper.
• [ ] A WebAudio implementation of the Dattoro reverb in Typescript.
• [ ] The MVerb2020 open source VST plugin implementation of the Dattoro reverb. This sounds better than the reverbsc opcode.

To repeat, the objective here is a pure Csound implementation of a studio quality reverb, which I could very much use with the WebAssembly build of Csound for my online cloud-music pieces.

The end product should be an MKGReverb.inc #include file in the same pattern as my other patches, using the signal flow graph opcodes for input and output, and global variables/control channels for control.

[gogins]

I wrote a test piece, and tested with the reverbsc opcode. I had been under the impression that this opcode blurred stereo location. That turns out not to be the case! So, reverbsc sounds good, does not blur stereo, and I can use it.

So I am closing this issue, although I may reopen it in the future because MVerb does things that reverbsc does not do.