how to reset sound source in PowerAudio?

I’m using the PowerAudio audio visualizer (https://7ph.github.io/poweraudio/)

How do I change the audio source once it’s initialized with:

this.myVisualizer = new PowerAudio.Viz({
                    container: '#visualization',
                    source: this.snd,
                });

Setting this.myVisualizer.source = newSource doesn’t work (the visualization goes empty), and re-creating a new PowerAudio.Viz() each time makes the vizualization jitter after a few goes (so it mustn’t be releasing some resources or something)