Question 1

How does the AI detect the musical key?

Accepted Answer

It computes a chromagram (12 pitch-class energies summed over the whole track) and matches it against 24 Krumhansl-Schmuckler key profiles (12 major + 12 minor) using cosine correlation. The best-matching profile wins. A confidence score is reported — values above ~80 % are reliable, below 60 % the result is uncertain. The whole pipeline runs in your browser via the Web Audio API and Meyda.

Question 2

What audio formats are supported?

Accepted Answer

Anything the browser can decode: MP3, WAV, OGG, AAC, M4A, FLAC, OPUS, plus video containers (MP4, MKV, MOV, WebM) from which the audio is auto-extracted. The Web Audio API handles decoding entirely on your device.

Question 3

What is musical key, exactly?

Accepted Answer

A key is a tonal centre plus a mode. C major means the music gravitates to the note C and uses the major-scale pattern of intervals (C, D, E, F, G, A, B). A minor uses the same notes but treats A as home. Knowing the key lets musicians transpose, harmonise, improvise solos that fit, and explains why some chords sound 'right' together.

Question 4

What's the Camelot wheel and how do I use it?

Accepted Answer

Camelot is a DJ-friendly numbering of the 24 keys around a circle. Each key has a number (1–12) and letter (A for minor, B for major). The rule: tracks sharing a Camelot code mix perfectly; ±1 around the wheel mixes well; jumping +7 (a perfect fifth) also works. C major = 8B, G major = 9B, F major = 7B, A minor = 8A. Mixed In Key, RekordBox and Beatport all label tracks this way.

Question 5

How accurate is the key detection?

Accepted Answer

On clearly tonal western music (pop, rock, classical, jazz with functional harmony), the Krumhansl-Schmuckler approach reaches 75–85 % accuracy on the standard MIREX test sets — competitive with commercial tools that use chromagrams. Atonal, modal, very short, or heavily modulating tracks score lower; the confidence percentage tells you how much to trust the answer.

Question 6

Why does the tool give a different key than what I think it is?

Accepted Answer

Common reasons: (1) relative-major / relative-minor confusion — C major and A minor share the same notes, look at the alternative keys list; (2) the song actually modulates, and what you hear is the second key; (3) heavy autotune or pitch effects warp the chromagram; (4) the recording is in a non-standard tuning (e.g. 432 Hz or baroque 415 Hz instead of A=440 Hz). Inspect the alternative-keys list — often the right answer is second on it.

Question 7

What does the cents deviation mean?

Accepted Answer

It tells you how far the detected pitch is from the nearest equal-tempered semitone. 0 cents = perfectly in tune. +5 cents = slightly sharp (5 % of a semitone above the nearest note). −20 cents = noticeably flat. Most listeners can detect deviations larger than about ±10 cents on sustained tones; ±5 cents is generally considered 'in tune'.

Question 8

Can I use this as a real-time guitar tuner?

Accepted Answer

Yes. The real-time mode opens your microphone via MediaStreamSource, runs YIN pitch detection on the live signal, and displays the detected note and cents deviation at 30+ updates per second. It works on any monophonic instrument: guitar, bass, violin, flute, voice. It does not work on chords or polyphonic instruments — YIN expects a single fundamental at a time.

Question 9

What is BPM detection based on?

Accepted Answer

We compute spectral flux (the rate of change of the magnitude spectrum, which spikes at note onsets) over the whole track and run autocorrelation on the resulting onset envelope. The peak of the autocorrelation in the 60–200 BPM range gives the dominant tempo. This is the standard Tempogram approach. It is accurate on songs with a clear pulse, less so on rubato, jazz with floating tempo, or free-time material.

Question 10

Does it work on Bolero, V-pop, salsa, samba, chanson, or other regional genres?

Accepted Answer

Yes for any tonal material — most popular Vietnamese, Latin, French, and Brazilian music sits comfortably in major or minor keys and detects reliably. Modal genres (Cape Verdean morna, certain Andalusian flamenco palos, modal jazz) may produce a 'best fit' major or minor that approximates the mode but isn't strictly correct. Confidence below 70 % is your signal that the genre or mix is fighting the algorithm.

Question 11

Is my audio safe and private?

Accepted Answer

Yes. Decoding, chromagram computation, key matching, and BPM detection all happen in your browser via the Web Audio API and Meyda. Your audio file is never uploaded. Real-time tuning uses your microphone locally and never streams audio anywhere. We don't store, log, or share anything you analyse.

Question 12

What if the key detection is uncertain (low confidence)?

Accepted Answer

The tool reports a confidence percentage. If it's below ~70 %, the result should be treated as a guess. Try (1) analysing a different section of the song that's harmonically clearer, (2) using a longer audio segment, (3) checking the alternative-keys list, or (4) listening to the song against a known reference key in your DAW or tuning app.

Kilojoules (kJ)	BTU
0.1 kJ	0.0947817 BTU
0.5 kJ	0.473909 BTU
1 kJ	0.947817 BTU
1.055 kJ	1 BTU
2 kJ	1.89563 BTU
5 kJ	4.73909 BTU
10 kJ	9.47817 BTU
20 kJ	18.9563 BTU
50 kJ	47.3909 BTU
100 kJ	94.7817 BTU
1000 kJ	947.817 BTU

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