A spring reverb model #167

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opened 2026-10-06 16:24:14 +00:00 by bcox · 0 comments

bcox commented

2026-10-06 16:24:14 +00:00

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bcox asked on 2026-10-06 for a ticket for each gap docs/feature-survey.md names without one, whether or not it is ever done. Engine claims are from reading the tree at 6a3fede9 on main. Instrument claims are from that document's research, read from the manuals by research agents and not re-checked; the sources are listed there. Nothing here is built, measured or listened to.

Summary

The reverb layer is a plate, a room or a hall with freeze; no spring. The GX-1's reverb is called a spring by Sound On Sound alone, the ARP 2600 has one built in, and docs/modular-gaps.md lists the spring as a module with no model and no ticket.

What the tree has

ReverbLayoutFor in the storage region, the plate's tank and the FDN lines; the long delay's line.

The work, as a sketch

A spring as a chain of allpass sections with dispersion (the "boing"), a short delay and a lowpass in the loop, in the region as the plate is; Parker's and Valimaki's spring models are the literature.

Open

Whether dispersion in fixed point at the region's word width rings or decays.

bcox asked on 2026-10-06 for a ticket for each gap `docs/feature-survey.md` names without one, whether or not it is ever done. Engine claims are from reading the tree at `6a3fede9` on `main`. Instrument claims are from that document's research, read from the manuals by research agents and not re-checked; the sources are listed there. **Nothing here is built, measured or listened to.** ## Summary The reverb layer is a plate, a room or a hall with freeze; no spring. The GX-1's reverb is called a spring by Sound On Sound alone, the ARP 2600 has one built in, and `docs/modular-gaps.md` lists the spring as a module with no model and no ticket. ## What the tree has - `ReverbLayoutFor` in the storage region, the plate's tank and the FDN lines; the long delay's line. ## The work, as a sketch - A spring as a chain of allpass sections with dispersion (the "boing"), a short delay and a lowpass in the loop, in the region as the plate is; Parker's and Valimaki's spring models are the literature. ## Open Whether dispersion in fixed point at the region's word width rings or decays.