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

BaseAudioContext: createBiquadFilter() method - Web APIs

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The createBiquadFilter() method of the BaseAudioContext interface creates a BiquadFilterNode, which represents a second order filter configurable as several different common filter types.

Note: The BiquadFilterNode() constructor is the recommended way to create a BiquadFilterNode; see Creating an AudioNode.

None.

A BiquadFilterNode.

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.setValueAtTime(1000, audioCtx.currentTime);
biquadFilter.gain.setValueAtTime(25, audioCtx.currentTime);

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