Piano Metronome — Practice Scales and Repertoire

How does a piano metronome work?

The tool schedules short synthesized clicks with the browser audio clock. Users can choose 40–240 BPM, simple and compound signatures from 2/4 through 12/8, one-, two-, triplet-, or four-part beat grids, a downbeat accent, volume, and silent bars. Piano presets load settings only; they do not listen to the instrument.

A 25 ms browser loop places short oscillator clicks up to 120 ms ahead on AudioContext.currentTime rather than trusting a visual interval as the sound clock. The optional first-beat accent uses 1400 Hz, main beats use 900 Hz, subdivisions use a softer 620 Hz tone, and each click ends after about 60 ms. Controls cover 40–240 BPM, signatures from 2/4 through 12/8, one-, two-, triplet-, or four-part beat division, volume, accent, and silent fourth or eighth bars. The piano presets only load Hands separate 50, Scales 60 with two subdivisions, Sight-read 72, or Technique 96 with four; they do not receive microphone or MIDI data.

The page generates a practice click; it does not listen to or grade a performance. Browser audio is scheduled against the audio clock, while visual changes can render later and background tabs may be suspended by the device.

How to get a useful result

A clean repetition at a documented BPM is evidence that coordination worked under that condition, not proof that a piece is finished. Begin below the first hesitation, count before playing, and decide what one click represents. Use a subdivision temporarily for note identification or hand alignment, then reduce support. Tempo should rise only when fingering, articulation, tone, and physical ease remain intact.

Define the practice condition before starting: Choose the relevant piano preset or set a BPM below the point where notes or coordination become unreliable. Decide what one click represents, use subdivision only as needed and record the BPM and meter so a later attempt is genuinely comparable.

When the click is not helping

• If the hands separate cleanly but fail together, start below both separate-hand tempos and align one beat or subdivision at a time.
• If the metronome causes stiff playing, lower BPM, reduce subdivision density, and listen for tone and release rather than chasing the click.
• If a passage contains rubato, use the click for structural practice first, then make deliberate expressive timing decisions away from it.
• If the visual light and click seem displaced, avoid Bluetooth and follow the scheduled audio pulse because display painting can lag independently.
• If a phone lock stops playback, keep the page active; browser audio is not guaranteed in a background or suspended tab.

Make the practice condition repeatable

Write down the BPM, meter, subdivision and what one main click represents. That note turns a vague impression of progress into a practice condition you can repeat tomorrow. Begin slowly enough that movement and sound remain controlled, complete several clean repetitions and raise the tempo in small steps only while the same technique remains intact.

Use dense subdivisions to diagnose uneven spacing, then remove some support and keep the smaller grid internally. Silent bars are another useful check: an early return suggests acceleration and a late return suggests slowing. Follow the scheduled audio click rather than the screen when Bluetooth or display rendering makes the visual pulse appear offset.