PulseKey TunerFirst: a note is not a key
A note is a pitch at a particular moment, such as A2. A key is the tonal home around which a passage of music is organised, such as A minor. A melody can move through many notes while remaining in one key. Ableton's introduction to keys and scales is a helpful starting point.
Use a single-note tuner for an instrument string or a sustained vocal note. Use key analysis when you want a starting point for playing along with a song, checking a sample or choosing a possible harmonic transition.
A practical key-detection workflow
- Choose a useful passage. Start with a section where the melody, bass or chords are clear. A drums-only introduction tells you much less about harmony.
- Use Key mode in PulseKey. Listen through the microphone or import an audio file you can access on your phone. With a file, select a region instead of assuming the entire song stays in one key.
- Read the estimate and its context. Look at the suggested key and confidence, then explore the relative key, scale notes and chords. Treat confidence as the app's assessment, not a promise that the musical answer is correct.
- Check by ear. Play the proposed tonic or a simple chord against the passage. Does it feel settled? Try the relative key too. C major and A minor share the same natural-note collection, so context matters.
- Check a second section. Compare the verse and chorus, or inspect the audio workspace's six-second windows. A changed result can be a clue to investigate rather than an error to ignore.
Why a key estimate can be uncertain
Short loops can leave out the notes that distinguish two keys. Music can also change key, borrow chords or avoid a strong tonal centre. Room noise, dense percussion and a quiet bass line add further difficulty. No useful detector should make you stop listening critically.
For microphone analysis, move away from conversation and give the phone a clear signal without overwhelming its microphone. If you have the original file, try analysing that. If the result remains ambiguous, save it as a working note rather than labelling it a fact.
Song recognition is different again. PulseKey estimates musical information. It does not identify a track's title or artist, and it does not retrieve music from a streaming-service link.
When you need the tuner instead
Switch to Tuner mode and play one sustained note. The note name identifies the pitch; cents show the offset from its target. Negative values mean flat and positive values mean sharp. Hz is the measured frequency. With A4 set to 440 Hz, an equal-tempered semitone spans 100 cents. See UNSW's note and frequency reference.
Mute neighbouring strings, let the initial pluck settle, and make small adjustments. A target-note lock can help keep attention on one string. Make sure the octave and target are sensible before increasing string tension.
Keep the result, not another pile of audio
PulseKey 1.1 can save a measurement with a title and notes. Name it for the part you checked, such as a chorus or a loop, and note any uncertainty. Its local library retains the analysis, not the source audio, so keep the original file separately if you will need it again.
For DJ use, Camelot and Open Key notation can help organise possibilities. A compatible key is only a starting point: phrasing, rhythm, arrangement and the actual sound of the transition still matter.
Try it with your next idea
Explore the key detector, instrument tuner and local library in PulseKey Tuner.
