ILL SEA MANUALS / springs

# Illthy Springsspring / FDN / IR reverb with Freeze

VST3 module in the NoAMP zip

Three reverbs in one box: the drippy chirp of a real spring tank, a lush clean FDN hall, and a Convolution engine that loads any reverb IR you've got.

## Controls

Control | What it does
--- | ---
Engine | Spring (allpass, coprime-tuned, per-voice dispersion) · FDN (8-line hall) · Convolution (load an IR, auto-leveled so it sits IN the mix instead of acting like a cab).
Amount / Decay | Dry/wet crossfade and tail length.
Pre-delay | 0–120 ms gap before the wet, keeps attacks articulate.
Low-cut / Damp | High-pass on the wet return; decay-dependent darkening (higher = darker).
Freeze | FDN engine: latch what you just played, forever. MIDI-learnable.
Freeze Length | Grab (classic 450 ms smeared drone) · 1/4, 1/2 Note, 1 Bar (a MUSICAL loop synced to tempo, freeze on the downbeat and your phrase pulses in time) · 250 ms–2 s fixed. Changing length WHILE frozen re-cuts the same phrase.
IR Level | Convolution engine trim.

## Specs, tersely

Spring | multi-voice allpass network, coprime delay spread, per-voice detuned dispersion, decay-dependent damping
FDN | 8-line feedback delay network, 4 s freeze capture ring, unity-gain musical looping (no rest-blasting RMS tricks)
Convolution | partitioned convolution, load-time RMS normalization + trim

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