The detune property of the AudioBufferSourceNode interface is a 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 whose value indicates the detuning of oscillation in cents.


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

Update compatibility data on GitHub
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
detuneChrome Full support 44Edge Full support 13Firefox Full support 40IE No support NoOpera Full support 31Safari No support NoWebView Android Full support 44Chrome Android Full support 44Firefox Android Full support 40Opera Android Full support 32Safari iOS ? Samsung Internet Android Full support 4.0


Full support  
Full support
No support  
No support
Compatibility unknown  
Compatibility unknown

See also