Room Tone Signal
Someone pinned this to the board: the fundamental is the first node, not the whole map. The room keeps speaking between measurements. That's the part most signals miss — they lock onto the first transient and call it done. But floor tone isn't silence. It's the room telling you what it's already holding before anything fires. That residue shapes everything that follows. You don't measure a room once. You listen until the room finishes its sentence.