Music production without guesswork
Turn ideas into precise decisions without leaving your session.
auroLab brings together the essential tools for shaping tempo, space, and harmony. Calculate, listen, and analyze in seconds so you can stay focused on what matters: your music.
The complete lab
Everything you need between an idea and its best version.
Delay calculator
Delay & Reverb
Turn tempo into milliseconds and Hz for delays, LFOs, pre-delay, and decay.
ms = 60000 / BPM × subdivision · Hz = 1000 / ms · dotted × 1.5 · triplet × 2/3
Suggested Reverb
| Space | Reference | Pre-delay | Decay | Total |
|---|---|---|---|---|
| Hall | 2 bars | 62.5 ms | 3937.5 ms | 4000 ms |
| Large room | 1 bar | 31.25 ms | 1968.75 ms | 2000 ms |
| Small room | 1/2 note | 15.63 ms | 984.38 ms | 1000 ms |
| Tight ambience | 1/4 note | 3.91 ms | 496.09 ms | 500 ms |
Delay Values
| Note | Normal | Dotted | Triplet |
|---|---|---|---|
| 1/11 bar | 2000 ms0.5 Hz | 3000 ms0.33 Hz | 1333.33 ms0.75 Hz |
| 1/22 beats | 1000 ms1 Hz | 1500 ms0.67 Hz | 666.67 ms1.5 Hz |
| 1/41 beat | 500 ms2 Hz | 750 ms1.33 Hz | 333.33 ms3 Hz |
| 1/8half beat | 250 ms4 Hz | 375 ms2.67 Hz | 166.67 ms6 Hz |
| 1/16sixteenth note | 125 ms8 Hz | 187.5 ms5.33 Hz | 83.33 ms12 Hz |
| 1/32thirty-second note | 62.5 ms16 Hz | 93.75 ms10.67 Hz | 41.67 ms24 Hz |
| 1/64sixty-fourth note | 31.25 ms32 Hz | 46.88 ms21.33 Hz | 20.83 ms48.01 Hz |
| 1/128micro delay | 15.63 ms63.98 Hz | 23.44 ms42.66 Hz | 10.42 ms95.97 Hz |
| 1/256texture | 7.81 ms128.04 Hz | 11.72 ms85.32 Hz | 5.21 ms191.94 Hz |
| 1/512short pre-delay | 3.91 ms255.75 Hz | 5.86 ms170.65 Hz | 2.6 ms384.62 Hz |
Clock
Metronome
A steady click with downbeat accent, tap tempo, and keyboard shortcuts.
interval = 60 / BPM s · look-ahead scheduler on the Web Audio clock (minimal jitter)
Tap tempo
Tap Tempo
Tap the pulse and calculate the average between hits. Halve or double it when you are working in half-time or double-time.
BPM = 60000 / average · robust average: median and outlier rejection (MAD)
Audio analyzer
BPM & Key Detector
Drop a WAV, MP3, FLAC, or AAC file. Analysis runs locally with Web Audio.
BPM: spectral flux and onset-interval histogram. Key: chroma (Goertzel) against Krumhansl-Schmuckler profiles using cosine similarity.