title: Change volume setting in ToneJS API
body: <p>I'm new to the world of library API's, and not having much luck figuring out ToneJS. In particular I, am trying to change the setting on <a href="https://tonejs.github.io/docs/r12/Volume#volume" rel="nofollow noreferrer">volume</a>.</p>
  
  <p>I've got: <code>let appVol = new Tone.Volume()</code>. I'd like the user to be able to change that default '0' setting. From looking at the link above, it seems like <code>appVol.volume = -12</code> should work to do this; it does not. </p>
  
  <p>What is the correct code to do this? And if you can explain it - what am I missing here?</p>