[Feature] Improve/eliminate the metallic sound of the reverberation and make it more natural, warm, and massive.

[Menorah]

Loving this fork so far , the native ViPER ports feel great. One suggestion: the Reverberation effect currently has a single, fairly basic algorithm (size/damping/width/wet-dry) that sounds a bit metallic next to the rest of the chain. Since the JamesDSP engine underneath already ships Progenitor2 (a Dattorro-lineage IIR network — the same family Dragonfly Room Reverb uses via Freeverb3), there seems to be room to expose a couple of selectable "flavors" instead of one fixed room model.

Three well-regarded, GPL-licensed reverbs that could work as reference for a warmer, less metallic tail (all license-compatible with this GPL-3.0 project):
. Dragonfly Reverb (GPL-3.0) — separate Hall/Room/Plate/Early-Reflections algorithms via Freeverb3
. MVerb (GPL-3.0) — Dattorro figure-eight topology, a common "studio" reference
. zita-rev1 (GPL) — hybrid Schroeder/8-channel FDN, hall-leaning.

With this in mind, you can improve the base reverb module, or add a new one (if it doesn't require much effort) with more configuration parameters, since what I'm looking for is for the reverb to sound natural (not metallic), warm, and at the same time have enough capacity to be massive and have a long tail.

No pressure at all if it's not a priority, just wanted to put it on your radar in case it's useful for the roadmap. Thanks for maintaining this!

[alienware377]

On it!

[alienware377]

Thanks for such a well-researched request — the sndfilter/Progenitor2 pointer was spot on, and it turned into a bigger feature than I first planned.

Shipped in v2.8.2. Reverberation now has four room types:

• Classic — the original ViPER model, still the default so existing presets sound exactly the same
• Plate — Dattorro's figure-eight tank, smooth and dense
• Concert hall — an 8-line feedback delay network with per-band decay, for a large warm space with a long tail
• Room — early reflections feeding a shorter tail, for a natural, believable space

All three new models were written from the published algorithms rather than copied from any codebase, so there's no licensing tangle.

Controls follow V4A naming — Room type, Room size, Decay time, Pre-delay, Damping, Diffusion, Tank modulation, Bass richness, Early reflections, Width, Wet, Dry — and sliders that don't apply to the selected room hide themselves, so each model shows only what it actually uses.

The metallic ringing you described is comb-filter character, which is inherent to the classic network. The Plate and Hall models avoid it by design, so those are the two I'd try first for warmth.

Credits added in Settings → About for Dattorro, Freeverb, zita-rev1, Dragonfly, MVerb and Sean Connelly's sndfilter.

Would love to hear how they sound to you — happy to tune the defaults if anything feels off.