- Do we both need to look at one screen?
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Yes: one Mac, one caption box, two paragraphs. Turn the Mac a little, or hold ⇧ and drag the box to the edge nearest the other person, and take the size up from Text Size and Alignment. On a call the app captions the other side; in the room, both of you.
- Do I have to tell it which language each of us speaks?
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No. The recognizer works out which of the sixteen is being spoken, sentence by sentence. You choose the one language to translate into; anything else that is said arrives in it, and what is said in it goes back into the last other language it heard. Until it has heard a second language there is nothing to translate back into, and a sentence in the target language stays as it was said.
- Does it record us?
- No. The audio is never recorded and nothing leaves the Mac; the ⌥ stack keeps the last few boxes in memory, and nothing is written to disk unless you save a transcript, from the app's offer or its menu. macOS shows its orange microphone indicator in the menu bar the whole time the app is listening, as it does for any app.
- What does the other person need?
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Nothing. No app, no account, no phone on the table. They read the box on your screen, in their language, and hear you in yours.
- Can it do the room and a call at the same time?
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No. Listen To is one source: the microphone or what the Mac plays. Choosing the microphone again puts it away, and capture goes back to the source it replaced.
- How good is the translation?
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Apple's own, the one in the Translate app, running on the Mac. Good enough to follow and to answer, not a certified translation, and a sentence that arrives oddly is worth asking about. Names are where it slips most, in both languages.