delay-time-calculator

Delay time (in a standard delay effect) is the interval between the dry signal and its first repeat — and between each subsequent repeat. It determines the rhythmic character of the delay: dotted 8th, quarter, 8th, etc. Pre-delay is a specific parameter in reverb processors that sets how long after the dry signal the reverb tail begins. It does not create audible echoes — the gap is typically too short (10–40ms) to be perceived as a separate repeat. Instead, pre-delay creates perceptual "space" between the dry signal and the reverb wash, preserving the clarity and impact of the original transient. Without pre-delay, dense reverb can smear the attack of a vocal or snare hit; with appropriate pre-delay, the reverb sounds full but the dry signal retains its presence and definition.

Both approaches are valid and serve different creative purposes. BPM-synced delay (using exact ms values from this calculator) creates rhythmically coherent repeats that lock into the groove — essential for delays meant to be musical and groove-forward. Un-synced delays (set by ear to a slightly off-beat value) create a looser, more organic feel — often more natural-sounding for subtle vocal doubling, slap echo, or ambient texture where the repeats blend into the background rather than asserting a rhythmic pattern. Classic technique: start with the BPM-synced value from the calculator, then nudge the delay time slightly (±5–15ms) until it "feels" right for the specific recording — especially useful on live or slightly tempo-imperfect recordings where a perfectly synced value can feel mechanical.

A triplet divides a note value into three equal parts instead of two — each triplet note is 2/3 the length of the standard note. A quarter-note triplet = 2/3 of a quarter note = 2 beats divided by 3. At 120 BPM, a quarter note = 500ms; a quarter-note triplet = 333ms. Triplets create a "swing" or "shuffle" feel — the characteristic groove of jazz, blues, and swing-influenced electronic music. In production, an 8th-note triplet delay (at 120 BPM: 167ms) can add a subtle swing feel to a delay effect, making it feel slightly behind or ahead of the beat in a musically natural way. Most DAWs have a "swing" or "groove" quantisation function that operates on this triplet timing principle.

Several methods work without a DAW: (1) Tap tempo: tap along to the beat for 8–16 bars and divide the total time by the number of taps. Most BPM calculators (including this site's dedicated tap tempo tool) automate this calculation. (2) Counting: count beats for exactly 15 seconds and multiply by 4 — accurate to ±2 BPM for most purposes. (3) Spectral analysis: upload the audio to a BPM detection tool (SoundStripe, BPM Analyser, or the BPM detection function built into Ableton, Logic, or Serato). (4) Audio fingerprinting services (Shazam, Soundiiz) sometimes report BPM in their song data. For production purposes, always verify with tap tempo after detection — automated BPM detection can fail on rubato sections, complex polyrhythms, or half-time/double-time feels where the detected BPM may be half or double the actual groove BPM.