Envelope Resonator

Parameters

Attack — How fast the envelope detector tracks rising input level, in ms (0.1–200). Fast attack (1–10 ms) catches sharp transients — the resonator opens up immediately on hits. Slow attack (50–200 ms) lets the envelope rise gradually — the resonator opens smoothly over time. Pair with release to shape the resonator’s dynamic response curve.

Release — How fast the envelope detector falls when input level drops, in ms (10–1000). Fast release closes the resonator quickly between hits (rhythmic, gated character). Slow release lets the resonator ring out across pauses (sustained, ambient character). For percussive sources, fast release matches the hits; for vocals or pads, slower release feels more natural.

Sensitivity — Detection threshold offset in dB, −24 to +24. Higher values require louder input before the envelope responds; lower values let the envelope respond to quieter material. Use to bias the detection toward the loudest peaks (high values) or to track smaller envelope variations (low/negative values).

Env Depth — How much the envelope modulates the resonator gain, 0–100%. 0% is no envelope effect (resonator runs at static gain). 100% is full envelope control — resonator opens and closes with the input dynamics. Lower values create a subtle “breathing” effect; 100% creates obvious dynamic resonance shaping.

Mix — Wet/dry blend, 0–100%. 100% full resonator output; lower values blend the original signal back in for parallel use. Resonators usually benefit from blending with the dry signal to keep the original transients intact.

Additional controls

Output Gain — Output makeup gain in dB, −12 to +12. Compensates for level changes from the envelope-controlled resonator.

Detection Mode — How the input envelope is measured. Peak — instantaneous level detection, fast and reactive (great for percussive triggering). RMS — short-window average, smoother and more program-aware (better for sustained material).

Detect Low Hz / detect High (Hz) — Frequency band (in Hz) used for envelope detection — 20 to 20000. Constrains which frequencies drive the envelope. Set the band around your trigger source: e.g. 60–200 Hz to follow only kick drum hits, 2000–8000 Hz to follow only cymbal/sibilance peaks. The resonator itself processes the full signal — only the detection is band-limited.

About Envelope Resonator

An envelope resonator is a resonator (like the Comb Resonator) whose ring is gated by the input level. When the input is loud, the resonator rings; when it’s quiet, it stays silent. The result is a rhythmic, dynamic resonance that pulses with the source — useful for “talky” filter effects on drums, “pumping” tonal layers on synths, or generating rhythmic pitched textures from noisy/percussive material. The detection band lets you trigger the resonator from one part of the spectrum (e.g. kick frequencies) while the resonator ring affects the full signal — similar to a bandsplit sidechain.

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