In this (where the audio and video are out of sync) a single horizontal line of the video matrix/image is output into a slider matrix (the green box). These values are written to an audio buffer which is very small (7 milliseconds). This wave form is repeated about 70 times per second. This makes the sound. A means of turning visual data (through horizontal scanning) into audio.
When the tone goes lower, that is when the 0.5 button is pressed. At this point, the amount of repetitions of the waveform per second is cut in half.
The box on the far right hand end of the screen is an audio scope. Each instance of the waveform (in the middle two boxes) is repeated many times per second and so it appears as spikes in the signal.
This is done with a preloaded movie, it could also be done live.
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