How to use the howler.Howler.masterGain function in howler

private createAnalyser(): void {
        const analyser = Howler.ctx.createAnalyser();
        Howler.masterGain.connect(analyser);
        this.analyserChange.next(analyser);
    }

setup() {
    const canvas = document.getElementsByTagName('canvas')[0];
    this.WIDTH = canvas.width;
    this.HEIGHT = canvas.height;

    this.analyser = Howler.ctx.createAnalyser();
    Howler.masterGain.connect(this.analyser);
    this.analyser.connect(Howler.ctx.destination);
    this.canvasCtx = canvas.getContext("2d");

    this.analyser.fftSize = 256;
    this.bufferLength = this.analyser.frequencyBinCount;
    this.dataArray = new Uint8Array(this.bufferLength);
  }