A liberation.

That of the carrier wave
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The tone, the signal, that carries the sound.

A clear separation between the scale of the system and the scale of the actions it's used for.

The repetition and uniformity of the mechanical is present, but only microsonically so, so that the total clarity, or near it, of the voice, or any other sound that's heard, is not turned into some regimented caricature of itself, as in writing, in order to enter the system.

but...

...that principle is also true of radio
which lacks most of what's good, in principle, of the phone.

so...

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