The idea is to use music and sound as a background.
They use sounds from old video games to create their music.
But we can't see any way that they could have used sound for communication.
Often music described a feeling or told a story using sounds.
A small number of clocks will use sound to show the time.
"Hollywood has always known how to use sound to control emotions, right?"
We've been used to making a certain type of music and using sounds to accomplish that.
I have never heard of sound being used for levitation any other way though.
Two other films with this title, but using sound, were produced in 1930 and 1937.
There he was trained to use sound as a diagnostic aid.