User suggestion: air pressure tone

[oliver-phet]

So, here’s my feature request. It’s in the “Waves Intro” sim.
Your sim includes a “play tone” option, which lets students hear the change in pitch and volume as they change the frequency and amplitude of the wave (which is awesome!).
The pressure meter lets students see the air pressure as the waves go by. They can visually see the doppler effect if they move the sensor toward the speaker while the continuous wvae generator is running. If you could include a tone generator on the air pressure meter, it would let students mess around with the doppler effect. There are certainly other ways to implement the same thing. But the thing I would like to see is a way to demonstrate the doppler effect with an audible tone.