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The detune property of the AudioBufferSourceNode interface is an k-rate AudioParam representing detuning of oscillation in cents.

For example, values of +100 and -100 detune the source up or down by one semitone, while +1200 and -1200 detune it up or down by one octave.


var source = audioCtx.createBufferSource();
source.detune.value = 100; // value in cents

Note: Though the AudioParam returned is read-only, the value it represents is not.


A k-rate AudioParam.


const audioCtx = new AudioContext();

const channelCount = 2;
const frameCount = audioCtx.sampleRate * 2.0; // 2 seconds

const myArrayBuffer = audioCtx.createBuffer(channelCount, frameCount, audioCtx.sampleRate);

for (let channel = 0; channel < channelCount; channel++) {
  const nowBuffering = myArrayBuffer.getChannelData(channel);
  for (let i = 0; i < frameCount; i++) {
    nowBuffering[i] = Math.random() * 2 - 1;

const source = audioCtx.createBufferSource();
source.buffer = myArrayBuffer;
source.detune.value = 100; // value in cents


Specification Status Comment
Web Audio API
The definition of 'detune' in that specification.
Working Draft  

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support Yes Yes40 No44 No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes Yes40 Yes ? ?

See also

Document Tags and Contributors

 Last updated by: SphinxKnight,