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Mod Delay

Mod Delay is a short-delay-line modulation effect.

Parameters

ParameterRangeDefault
Rate0.01 – 10.00.5
Depth0.0 – 10.03.0
Feedback0.0 – 99.050.0
Dry/Wet0.0 – 1.00.5

Rate — LFO rate in Hz, 0.01–10. Controls how fast the modulation oscillates. Slow rates (0.05–1 Hz) produce slow chorus-style movement; mid (1–4 Hz) classic chorus/flanger territory; fast (5–10 Hz) approaches vibrato-like wobble.

Depth — LFO depth in ms, 0–10. Sets how much the delay time is modulated by the LFO. Small depths (0.5–2 ms) gentle chorus; medium (3–6 ms) clear flanger sweep; large (7–10 ms) extreme detuning/wobbly character. Pairs with mode — flanger needs deeper modulation than chorus to sound right.

Feedback — Feedback amount, 0–99%. Routes the modulated output back into the delay input. 0% is no feedback (cleanest chorus). 30–60% adds resonant ringing (classic flanger character). 80–99% pushes the effect into self-oscillation territory — hissing, screaming, sometimes useful for intense sound-design.

Dry/Wet — Equal-power blend between dry (0) and modulated signal (1). 0.5 is the standard chorus/flanger setting where dry and modulated are equally present.

Additional controls

Mode — Effect mode:

  • Chorus — short delay (~20–40 ms), mild modulation, blended with dry → “thickening” effect, multiple voices feel.
  • Flanger — very short delay (~1–10 ms), modulated through a comb-filter range, with feedback → distinctive “jet sweep” character.

Both share the same rate/depth/feedback controls; the mode sets the underlying delay range and the typical sonic character.

About Mod Delay

Mod Delay is a short-delay-line modulation effect. The audio is sent through a short delay; the delay time is modulated by an LFO; feedback (optional) routes the output back in. Different delay ranges produce different effects: very short delays with feedback = flanger; medium delays without feedback = chorus. K2K’s Mod Delay handles both via the mode switch. Use it for: thickening vocals and synths (chorus mode), adding sweep and movement to leads and guitars (flanger mode), or as a building block for more complex modulation chains. Compare with Phaser (different topology — allpass network rather than delay line) and Leslie (rotating-speaker simulation rather than LFO modulation).


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