Speaker (piezo) not working (no audio/sound) on Bangle.js

Actually, I got it working now.

The solution:

reset();

Now this works (makes a small beep):

Bangle.beep();

And now jingle bells app is working!

Looks like it just needed a reset....

Interestingly my current setting is set to 'Vibrate' under beep... not sure if that's relevant.