Spectral Echo

Parameters

Decay (dB) — How much each echo is attenuated relative to the previous one, in dB, −20 to 0. −6 dB is a comfortable repeat-to-repeat fade (each echo half as loud as the previous). −20 dB makes echoes drop fast (only the first 1–2 audible). 0 means no attenuation — every echo identical to the original (useful for stutter-like effects but can clip).

Freq Decay (Hz) — Per-echo high-frequency rolloff, in Hz, 0–10000. As echoes accumulate they progressively lose high frequencies — simulating how acoustic spaces or tape delays naturally darken with each bounce. 0 is no rolloff (echoes stay bright); lower values produce darker, more vintage-feeling decays.

Mix — Equal-power blend between dry (0) and the echo signal (1). At 0.5 the echoes sit alongside the dry signal; at 1 you hear only the echoes.

Output Gain — Output level in dB, −24 to +12. Echoes can push level around (especially with low decay_db) — use this to bring output back to taste.

Additional controls

Echo Delay Ms — Time between echo repeats, in ms, 10–2000. Short delays (10–80 ms) produce a metallic, comb-filtered echo. Medium (100–300 ms) is the classic slapback/echo range. Long (500–2000 ms) gives slow, distinct repeats.

Count — Number of echoes generated, 1–20. Each successive echo gets attenuated by decay_db dB relative to the previous one. With high decay values you’ll only hear the first few even if count is set high; with low decay values all repeats are audible.

About Spectral Echo

Spectral Echo generates a fixed number of decaying repeats at equal time intervals — closer to a tape echo or simple delay-line effect, but operating spectrally so the frequency-decay-per-bounce is precisely controllable. Spectral Delay (the other delay-family node) is a single feedback delay with per-bin time variation — different effect, different use case. Use Echo for clean rhythmic repeats with controlled spectral darkening; use Spectral Delay for smearing, dispersive, sweeping delay effects.

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