npm install -S altnode.mixer-gain-node
constructor(audioContext: AudioContext, numberOfInputs = 2)
getChannelGain(channel: number): AudioParam
import MixerGainNode from "altnode.mixer-gain-node";
let audioContext = new AudioContext();
let oscillator1 = audioContext.createOscillator();
let oscillator2 = audioContext.createOscillator();
let oscillator3 = audioContext.createOscillator();
let mixer = new MixerGainNode(audioContext, 3);
let t0 = audioContext.currentTime;
let t1 = t0 + 5;
oscillator1.frequency.value = 440;
oscillator1.start(t0);
oscillator1.stop(t1);
oscillator1.connect(mixer, 0, 0);
oscillator2.frequency.value = 660;
oscillator2.start(t0);
oscillator2.stop(t1);
oscillator1.connect(mixer, 0, 1);
oscillator3.frequency.value = 880;
oscillator3.start(t0);
oscillator3.stop(t1);
oscillator1.connect(mixer, 0, 2);
mixer.getChannelGain(0).value = 0.1;
mixer.getChannelGain(1).value = 0.2;
mixer.getChannelGain(2).setValueAtTime(0, t0);
mixer.getChannelGain(2).linearRampToValueAtTime(0.5, t1);
mixer.connect(audioContext.destination);
MIT