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This is the first explainer in this thread that makes me see the issue. All this time I'm thinking along the lines of "Okay you're, projecting video in a wedding. Now there's an orange dot on the screen. Boohoo."

So, apparently, I gotta dream bigger. Like museum AVP or concert/live performance/DJing type of live visuals. Yeah now an orange dot is a showstopper.

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Why do you need to record sound when presenting some video? I’m a total noob in this, just curious.

I’m generalizing, but basically:

Live visualization takes a live music performance as input and programmatically generates a video that matches said music performance. The video might pulse along with the beat of the music. Or maybe it changes color or shape depending on the “mood” of the audio. The computer driving the visualization receives audio from the live music via a line in, which Apple treats as an active microphone.

A simple live visualization would be to display a video showing the waveform of the live audio feed.

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