We're introducing new concepts here, so the javascript hasn't changed all that much since Lesson 05
Choose a waveform
Make sure your volume is up
Play these black or white keys on your computer keyboard
(not designed for mobile devices or touch screens)
You may wish to see what these oscillations "look" like
Now take a moment to learn a bit more about sound:
(Note: Old-School Youtube, at some point, suppressed pure sine waves, so you won't hear them, here —too bad! But
it's just a couple spots.
Find me a more complete and friendly introduction to the topic, and I'll
substitute it here