ReadonlyidOptional ReadonlyknownWhich of the state's fields the row actually KNOWS, where it distinguishes them from a floor it is merely displaying (the head-amp's phantom/pad/SENS). Absent where the row makes no such distinction — never a claim that nothing is known.
ReadonlypathOptional ReadonlyrevThe console revision as of when the row was produced — the stamp the root stream's events carry, so a consumer running a ConvergenceClient accounts for what it received exactly as a browser tab does. Absent only on a console wired without the instrument.
Readonlystate
One entity instance as the console holds it: the root stream's event body, unserialised.
pathis the registered TEMPLATE (/channel/{kind}/{index}/fader) andidthe instance's canonical address — the same pair a client keys its store by, so a consumer of this feed and a consumer of the SSE stream index their world identically.