WebAudio BPM Tap Tempo, Metronome, Delay Time & Note Frequency Studio (2026)

There are 60,000 milliseconds in one minute. Dividing 60,000 by the tempo in Beats Per Minute gives the duration of a single quarter note (1/4 note): $T_{1/4} = 60000 / \text{BPM}\text{ ms}$. From that quarter-note base, a 1/8th note is half ($T_{1/4} / 2$), a 1/16th note is a quarter ($T_{1/4} / 4$), a Dotted note multiplies the straight value by $1.5$, and a Triplet multiplies the straight value by $2/3$ ($0.6667$).

Set your Reverb Pre-Delay to a short subdivision like a 1/64th or 1/32nd note (typically 15 ms to 45 ms) to create a clean Haas-effect separation between the dry vocal transient and the onset of the reverb tail. Then subtract that Pre-Delay from a 1/2-note or 1-Bar duration to set your RT60 Decay Time so the reverb tail finishes right on the downbeat.

A Dotted 1/8th note equals three 1/16th notes ($0.75$ of a beat). When you play steady 1/8th notes through a Dotted 1/8th delay (popularized by U2's The Edge and modern synthwave/EDM producers), every delayed echo lands squarely on the off-beat 1/16th grid between your dry notes, creating an intricate 16th-note syncopated groove.

In 12-Tone Equal Temperament (12-TET), every octave doubles the frequency and is divided into 12 logarithmically equal semitones (each semitone multiplies frequency by $2^{1/12} \approx 1.059463$). Given concert pitch $A_4 = 440\text{ Hz}$ (MIDI note 69), any MIDI note $m$ has frequency $f = 440 \times 2^{(m - 69)/12}\text{ Hz}$.

`setInterval()` runs on the browser's main UI thread and is subject to garbage-collection pauses, layout repaints, and background tab throttling (often jittering by 10–30 ms). Our metronome uses the Chris Wilson two-clock lookahead architecture, scheduling oscillator envelopes directly onto the hardware audio clock (`AudioContext.currentTime`) with sub-millisecond sample accuracy.