Delay is a rhythmic effect that repeats audio at a precise interval, creating echoes, slapback effects, or rhythmic patterns that lock to the beat. Unlike reverb, which is a wash of continuous reflections, delay creates distinct, audible repeats that sit alongside the original sound.
When delay time is synced to your song’s BPM (beats per minute), it feels locked in with the rhythm, creating a professional, intentional effect. When it’s not synced, delay can sound sloppy or disconnected.
Understanding delay time—how to calculate it, set it, and apply it musically—is essential for modern music production across all genres.
What Delay Time Is
Delay time is the interval in milliseconds between when a sound is played and when its first repeat is heard. If you set delay to 500 milliseconds, the original sound plays, and a copy of it is heard 500 ms later. That repeated sound is the “delay.”
Delay differs from reverb. Reverb is a continuous wash of reflections that decay smoothly over time. Delay produces distinct repeats—you can count them. Reverb simulates a physical space; delay creates a rhythmic, often musical effect.
Delay has several parameters:
- Delay Time: The interval in milliseconds between repeats.
- Feedback: How much of the delayed signal feeds back into itself, creating multiple repeats. High feedback = many repeats; low feedback = one or two repeats.
- Wet/Dry Mix: The balance between the original (dry) sound and the delayed (wet) signal.
- Stereo Spread: In stereo delay, left and right channels can have different delay times, creating a wider, more spacious effect.
Delay Time and BPM: Converting to Milliseconds
The foundation of synced delay is converting your song’s BPM to milliseconds. This tells you how many milliseconds each beat takes.
The formula is simple:
MS per beat = 60,000 / BPM
At 120 BPM: 60,000 / 120 = 500 ms per beat (quarter note).
From there, you can calculate any note subdivision:
- Whole note: 2,000 ms (4 beats)
- Half note: 1,000 ms (2 beats)
- Quarter note: 500 ms (1 beat)
- Eighth note: 250 ms (half a beat)
- Eighth-note triplet: 333 ms (1/3 of a beat, swung feel)
- Sixteenth note: 125 ms (quarter of a beat)
- Dotted eighth note: 375 ms (1.5 beats, syncopated feel)
Example: At 100 BPM, a quarter note is 600 ms. At 90 BPM, a quarter note is 667 ms. The same BPM value applies across genres, so you can use the same calculation for a ballad and an uptempo dance track.
Use the delay time calculator to instantly convert your BPM to milliseconds without doing the math.
Common Synced Delay Times
Different synced delay times create different effects:
Quarter-Note Delay (500 ms at 120 BPM): One beat of delay. Creates a clear, rhythmic repeat that aligns with the downbeat. Popular on vocals, lead instruments, and synths. The repeat feels aligned with the groove.
Eighth-Note Delay (250 ms at 120 BPM): Half a beat of delay. Creates a faster, tighter repeat. Often used on rhythmic elements (percussion, synth stabs) where you want the repeat to feel quick and snappy.
Dotted Eighth-Note Delay (375 ms at 120 BPM): 1.5 beats of delay. Creates a syncopated, swung feel. The repeat sits slightly ahead of the next downbeat, creating a sense of forward momentum. Popular in rock, funk, and indie music.
Eighth-Note Triplet Delay (333 ms at 120 BPM): A triplet subdivision, creating a 1/3-beat repeat. This syncopated timing works well on vocal doubles and creates a subtle, musical effect.
Half-Note Delay (1,000 ms at 120 BPM): Two beats of delay. Longer, more spacious. Creates more space between the original and the repeat. Good for ambient or atmospheric effects, or on lead vocals where you want delay to sit back.
The most common choice is quarter-note or dotted eighth-note delay, as these feel most natural to human ears aligned with common musical rhythm patterns.
Delay Feedback and Repeats
Feedback controls how many times the delayed signal repeats before fading away. It’s usually expressed as a percentage (0–100%) or as a raw value depending on your plugin.
Low Feedback (0–20%): One or two clear repeats. The second repeat is much quieter than the first. Creates a subtle slapback effect. Good for vocals and clean, articulate sources.
Medium Feedback (30–60%): Multiple repeats, each successively quieter. Creates a sense of motion and depth. The delay tail lasts several beats before fading. Popular on melodic elements and synths.
High Feedback (70–90%): Many repeats, taking up significant time and space. The delay can ring out for bars and bars. Creates atmospheric, spacious effects. Use carefully so the effect doesn’t overwhelm the mix.
Maximum Feedback (90–100%): The delay essentially never stops. The feedback loop sustains indefinitely. Rarely used in modern production except for experimental or creative effects.
A practical starting point: set feedback to around 40–50%. This creates enough repeats to feel musical without becoming overbearing. Adjust from there based on how much space you want.
Delay by Source and Genre
Vocals
Lead vocals often use quarter-note or dotted eighth-note delay with low feedback (20–30%), creating one or two repeats that sit slightly behind the vocal. This adds space and depth without muddying clarity.
Rap vocals might use a shorter delay (sixteenth-note or eighth-note) with low feedback for a tighter, more rhythmic effect.
Background vocals or doubles might use the same delay as the lead or slightly longer for a more spacious, separated feel.
Instruments (Guitar, Synth, Keys)
Electric guitar often uses dotted eighth-note or quarter-note delay, creating repeats that lock to the groove. This is especially popular in rock, indie, and alternative music where delay adds space and rhythmic interest.
Synthesizers and pads can use longer delays (half-note or even full-bar delays) with higher feedback, creating evolving, atmospheric textures.
Acoustic guitar typically uses quarter-note delay with low feedback to add space without making the instrument sound “processed.”
Drums and Percussion
Drums usually get minimal delay, if any. Kick drums are typically bone-dry; delay would cloud the rhythm.
Snare or clap can use a short delay (sixteenth-note or eighth-note) with very low feedback (10–20%) for a crisp, rhythmic effect.
Percussion instruments and synth stabs can use quarter-note delay to create rhythmic repetition that’s locked to the beat.
Drums and Percussion Effects
Delay on rhythm instruments should be short and tight. Long delays blur the rhythm and make the mix feel sloppy.
How to Set Delay Time in Your DAW
Most modern DAWs and delay plugins support tempo sync. Here’s how to set it:
Enable Tempo Sync
Look for a “Sync” button or toggle (often labeled with a link icon or BPM symbol) in your delay plugin. Enable it.
Select Note Subdivision
Once sync is enabled, a dropdown menu appears with note subdivision options (quarter note, eighth note, dotted eighth note, etc.). Select the note length you want.
The plugin automatically calculates the millisecond value based on your project’s BPM.
Manual Setting (If No Sync)
If your plugin doesn’t support automatic tempo sync, calculate the millisecond value for your desired note length and enter it directly in the “Delay Time” or “Time” parameter.
Adjust Feedback
Set feedback (often labeled “Feedback,” “Repeats,” or “Decay”) to control how many repeats you hear. Start at 40–50% and adjust to taste.
Balance Wet and Dry
The “Mix” or “Wet/Dry” slider controls the balance between the original sound and the delayed signal. Start at 30–50% wet (delay) to keep the original sound prominent while letting the delay enhance it.
Delay vs. Reverb: Key Differences
Understanding the distinction between delay and reverb helps you use each tool correctly:
Delay creates distinct, countable repeats at a specific time interval. It’s rhythmic and can be synced to tempo. It creates repeats you can hear individually. Delay is a creative effect that adds dimension and rhythmic interest.
Reverb creates a continuous wash of reflections that decay smoothly. It simulates a physical space. You don’t hear individual repeats—just a smooth tail of sound fading away. Reverb is more about spatial depth and cohesion.
In a mix, reverb sits in the background, placing all sources in a shared space. Delay is more upfront and rhythmic, creating repeats you notice.
You can use both in the same mix: reverb on multiple sources via a shared send return for cohesion, and delay on lead elements (vocals, instruments) for rhythmic interest.
Frequently Asked Questions
Should I sync all delay to my BPM?
For most modern music production, yes. Synced delay feels locked in with the rhythm and sounds intentional. Unsync’d delay can work for experimental or non-rhythmic music, but synced is the standard and usually sounds more professional.
What’s the difference between slapback and delay?
Slapback is delay with very low feedback—typically a single, audible repeat of the source. It’s a specific type of delay effect, not a different thing. A quarter-note delay with 10% feedback creates a slapback effect.
Can I use different delay times on different sources?
Yes, though it’s less common. Most production uses one primary delay time (e.g., quarter-note) across the mix for cohesion. But you might use a shorter delay (eighth-note) on rhythm elements and a longer delay (half-note) on ambient elements. Experiment to see what serves your mix.
How do I know if delay is working or just cluttering the mix?
Mute the delay effect entirely, then turn it back on. If the delay noticeably improves the mix—adds space, rhythmic interest, or depth—keep it. If the mix sounds better without it, remove it. Delay should enhance, not muddy.
What if my DAW doesn’t show my BPM accurately?
Make sure your DAW is set to the correct tempo. Check the tempo ruler or tempo indicator. If you’re unsure, you can manually calculate the delay time using the formula (60,000 / BPM) and enter the millisecond value directly. This bypasses the sync feature but gives you exact control.