Spectral Mod Delay

Parameters

Base Delay Ms — Base delay time in ms, 0–100. Center delay around which per-bin variation happens (when delay_spread is non-zero). Short delays (1–10 ms) produce flanger-like comb effects with rich modulation; mid (15–40 ms) chorus territory; longer (50–100 ms) approaches slap-back delay character.

Feedback — Feedback amount, 0–0.95. Routes the modulated delay output back into the input. Low values (0–0.3) clean modulation. High values (0.7–0.95) produce resonant, sustained modulation tails — careful at high settings, can self-oscillate.

Output Gain (dB) — Output gain in dB, −24 to +24.

Wet Dry Mix — Equal-power blend between dry (0) and modulated output (1). Labeled “Dry/Wet” in the UI.

Delay Spread — Per-frequency delay spread, 0–1. The defining parameter of this node: instead of one delay time for everything, delay_spread distributes different delay times across frequencies. 0 = uniform delay (all frequencies arrive together — equivalent to a regular short delay). Higher values progressively spread the delay times per bin — different parts of the spectrum arrive at different times, producing a smearing, shimmering modulation character that no time-domain mod-delay can produce.

Additional controls

Spread Dir — Direction of the per-frequency delay spread:

• Low — low frequencies delayed more than highs (lows trail behind, highs lead).
• High — high frequencies delayed more than lows (highs trail behind, lows lead).
• Center — frequencies near the center of the spectrum delayed most, edges lead. (Or vice versa depending on delay_spread sign.)

The empty 4th option is unused.

About Spectral Mod Delay

Spectral Mod Delay is the spectral-domain cousin of the regular Mod Delay. While Mod Delay applies one delay time uniformly (modulated by an LFO), Spectral Mod Delay distributes delay times per frequency bin — different parts of the spectrum can have entirely different delay times. The result is a unique smearing, shimmering modulation that produces effects between flanger, chorus, and a frequency-dependent dispersive delay. Use it for: complex shimmer that no traditional flanger/chorus can match, gentle “spectral movement” that feels organic without being obvious modulation, sound-design where you want the modulation character to vary across the spectrum, or as a more experimental alternative to standard modulation effects. Compare with Spectral Delay (Time category) for longer per-bin delay times with LFO and tilt; this node is shorter-range and doesn’t expose LFO controls — it’s about static per-bin spread rather than time-varying modulation.

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