Audio Delay, Reverb & LFO Tempo Synchronizer Studio
Calculate exact milliseconds (ms), LFO frequencies (Hz), sample-accurate DAW buffer offsets, and tempo-synced reverb decay times for any BPM. Features live Web Audio API auditioning and tap tempo.
Audition Synthesizer & Stereo Engine
Fine-tune tone impulse, feedback repeats, stereo width, and headphone volume.
| Note Division | Straight (1.0×) | Dotted (1.5×) | Triplet (0.667×) |
|---|---|---|---|
1/1Whole Note (1 Bar) | |||
1/2Half Note (2 Beats) | |||
1/4Quarter Note (1 Beat) | |||
1/8Eighth Note | |||
1/16Sixteenth Note | |||
1/32Thirty-Second Note | |||
1/64Sixty-Fourth Note | |||
1/128One Hundred Twenty-Eighth |
To create a wide 3D stereo image without phase cancellation, set the Left channel delay to a Straight 1/8th note and the Right channel to a Dotted 1/8th note. Always sum your mix to mono on master output to verify vocal clarity.
Audio Delay & Reverb Tempo Sync Cheat Sheet
Calculated Project Tempo: 128.0 BPM • 4/4 Time Signature
Note Subdivisions Timing Matrix (128.0 BPM)
| Note Division | Straight (ms) | Dotted (ms) | Triplet (ms) | LFO (Hz) |
|---|---|---|---|---|
| 1/1 (Whole Note (1 Bar)) | 1875.00 ms | 2812.50 ms | 1250.00 ms | 0.533 Hz |
| 1/2 (Half Note (2 Beats)) | 937.50 ms | 1406.25 ms | 625.00 ms | 1.067 Hz |
| 1/4 (Quarter Note (1 Beat)) | 468.75 ms | 703.13 ms | 312.50 ms | 2.133 Hz |
| 1/8 (Eighth Note) | 234.38 ms | 351.56 ms | 156.25 ms | 4.267 Hz |
| 1/16 (Sixteenth Note) | 117.19 ms | 175.78 ms | 78.13 ms | 8.533 Hz |
| 1/32 (Thirty-Second Note) | 58.59 ms | 87.89 ms | 39.06 ms | 17.067 Hz |
| 1/64 (Sixty-Fourth Note) | 29.30 ms | 43.95 ms | 19.53 ms | 34.133 Hz |
| 1/128 (One Hundred Twenty-Eighth) | 14.65 ms | 21.97 ms | 9.77 ms | 68.267 Hz |
Tempo-Matched Reverb Decay & Pre-Delay Spaces
| Acoustic Space | Recommended Pre-Delay | Pre-Delay (ms) | Decay Time (RT60) |
|---|---|---|---|
| Tight Drum Booth / Small Room | 1/64 note | 29.3 ms | 0.47s (1 beats) |
| Vocal Studio Chamber | 1/32 note | 58.6 ms | 0.94s (2 beats) |
| Vintage 80s EMT Plate | 1/16 note | 117.2 ms | 1.88s (4 beats) |
| Orchestral Concert Hall | 1/16 note | 117.2 ms | 3.75s (8 beats) |
| Ambient Cathedral / Drone | 1/8 note | 234.4 ms | 7.50s (16 beats) |
The Mathematics of Tempo-Synchronized Time & Modulation
In modern audio engineering and music production, time-based audio effects (delays, echoes, reverbs, tremolos, and LFO modulation filters) must be mathematically locked to the tempo of the project to prevent phase smearing and sonic mud. Because musical tempos are measured in Beats Per Minute (BPM) while hardware processors and VST/AU audio plugins measure time in milliseconds (ms), frequencies in Hertz (Hz), and buffers in sample frames, producers require precise conversion formulas. A quarter note at 120 BPM equals exactly 500 ms (60,000 / 120); a dotted 1/8th note adds 50% duration (375 ms) to create the signature syncopated bounce heard in classic dub, U2 guitar delays, and modern techno.
Key Technical Specifications:
- Quarter Note Constant Formula: T_quarter = 60,000 / BPM (in milliseconds). All subdivisions derive from 240,000 / (BPM * fraction).
- Dotted Note Modifiers: Dotted notes extend standard duration by exactly 50% (Duration * 1.5), producing rhythmic push-pull tension.
- Triplet Note Modifiers: Triplet divisions fit 3 notes into the space of 2, calculated as Duration * (2 / 3) (or 0.6667x).
- LFO Modulation in Hertz: LFO rate (Hz) = 1,000 / Duration_ms. Allows analog synths and filter cutoffs to oscillate in exact rhythmic lockstep.
- Sample-Accurate DAW Buffers: Exact sample count = (Duration_ms / 1,000) * SampleRate. Essential for phase alignment and granular delay lines at 44.1kHz, 48kHz, 96kHz, and 192kHz.
- Acoustic Reverb RT60 Synchronization: Matching reverb decay times to 1, 2, or 4 musical bars ensures the acoustic tail naturally dissipates right before the next transient downbeat.
Step-by-Step Mixing Guide: How to Dial In Perfect Delays & Reverbs
1. Establish or Tap Your Project BPM
Enter your project tempo directly or use the interactive Tap Tempo button by tapping your spacebar or mouse 4 to 8 times along with your track’s kick or snare.
2. Select Your Delay Purpose (Slapback vs Bouncing Echo)
For subtle vocal thickening, choose a fast 1/32nd or 1/64th slapback (20ms–80ms). For rhythmic groove and modern electronic bounce, select a Dotted 1/8th note or 1/4 note delay.
3. Audition the Delay in Real Time
Click the "Audition Delay" button to hear a live Web Audio synth pluck or rimshot pulse through the delay network with feedback and stereo width.
4. Set Reverb Pre-Delay to Protect Vocal Transients
Never use 0ms pre-delay on lead vocals or snares. Setting a 1/32nd or 1/64th note pre-delay (15ms–45ms) allows the initial dry consonant to be heard clearly before the reverb bloom opens up.
5. Match Reverb Decay (RT60) to the Song Structure
Set your reverb decay time to exactly 1 musical bar for snare drums or 2 bars for ambient vocals. This ensures the reverb tail fades cleanly right as the next downbeat lands, eliminating low-mid mud.
Top Troubleshooting Pitfalls & Solutions
Common Questions on Audio Delay, Reverb & LFO Tempo Synchronizer Studio
How do you calculate delay time in milliseconds from BPM?
Divide 60,000 (the number of milliseconds in one minute) by the BPM to find the length of a single quarter note in milliseconds. For example, at 120 BPM: 60,000 / 120 = 500 ms. For an eighth note, divide 500 ms by 2 to get 250 ms. For a dotted eighth note, multiply 250 ms by 1.5 to get 375 ms.
Why is dotted 1/8th note delay so popular in music production?
A dotted 1/8th note delay falls exactly three 16th notes after the original sound. When played over standard straight 4/4 drums, the delayed echoes hit on the off-beats and interlocking syncopated rhythms, creating a galloping, hypnotic groove without clashing with the main beat.
Why should I sync my reverb decay time to the song tempo?
When reverb decay times are chosen randomly, the ambient tail from one snare hit or chord often lingers into the next chord change, creating sonic clutter in the low-mids (250 Hz – 500 Hz). By timing the reverb decay to 1 or 2 musical bars, the tail decays to silence just as the next transient arrives, keeping the mix clean and punchy.
How does LFO frequency in Hz relate to delay time in ms?
Frequency in Hertz measures cycles per second, while delay in milliseconds measures the duration of a single cycle. Because there are 1,000 milliseconds in a second, dividing 1,000 by the delay time in milliseconds gives the exact frequency in Hertz (Hz = 1,000 / ms). For example, a 250 ms eighth note at 120 BPM equals an LFO rate of 4.0 Hz.
What is reverb pre-delay and why is it important?
Pre-delay is the gap in time between the dry original sound (such as a lead vocal or snare drum) and the first reflection of the reverb. Setting a tempo-synced pre-delay (typically 15ms to 40ms) prevents the reverb from smearing the opening consonant of a word, keeping vocals upfront and intimate while maintaining a lush space.