Extend [freeverb](https://github.com/klknn/kdr/blob/master/bin/freeverb/main.d) to provide - [ ] GUI - [ ] builtin side-chain effect commonly used for lead synth ([video)](https://www.youtube.com/watch?v=3UBuuKaq8Jw) and vocal - [ ] multi-buffer reverb switching like TAILS - [ ] SIMD ops for parallel comb filters and pipeline all-pass filters
Extend freeverb to provide