Understood.
I was just afraid, because many people want to prefer 5.1 over 2.0 just "because 5.1 is cooler", not because there are real 3D positioning parameters available at all (they tend to waste bitrate by uselessly blowing up audio streams).
So I'm probably not quite your target: Ambisonic might be fine for chill-out music, but not suitable for giving audio sources (like speech in movie audio) a more exact position in a sound space, or even reverse-engineer 5.1 sound from ProLogic encodes.
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