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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/BiquadFilterNode/detune below:

BiquadFilterNode: detune property - Web APIs

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The detune property of the BiquadFilterNode interface is an a-rate AudioParam representing detuning of the frequency in cents.

An a-rate AudioParam.

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

The following example shows basic usage of an AudioContext to create a Biquad filter node. For more complete applied examples/information, check out our Voice-change-O-matic demo (see app.js lines 108–193 for relevant code).

const audioCtx = new AudioContext();

// Set up the different audio nodes we will use for the app
const analyser = audioCtx.createAnalyser();
const distortion = audioCtx.createWaveShaper();
const gainNode = audioCtx.createGain();
const biquadFilter = audioCtx.createBiquadFilter();
const convolver = audioCtx.createConvolver();

// Connect the nodes together

source = audioCtx.createMediaStreamSource(stream);
source.connect(analyser);
analyser.connect(distortion);
distortion.connect(biquadFilter);
biquadFilter.connect(convolver);
convolver.connect(gainNode);
gainNode.connect(audioCtx.destination);

// Manipulate the Biquad filter

biquadFilter.type = "lowshelf";
biquadFilter.frequency.value = 1000;
biquadFilter.gain.value = 25;
biquadFilter.detune.value = 100;

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