Readonlycoherence0..1 — how much of the two signals is genuinely shared. Below ~0.5, do not act.
ReadonlydelayPositive means the TARGET is late and must be delayed LESS; the correction is its negation.
ReadonlyframesHow many frames were averaged.
ReadonlykindReadonlypolarityWhat the target's polarity should be for the two to sum.
ReadonlyresidualDegrees of phase the delay and polarity did NOT explain. Decides the all-pass question.
What a fit answers with when it CAN answer.