Optional ReadonlybalanceThe matrix strip's own L/R BALANCE (−1 hard-L … 0 centre … +1 hard-R). Absent ⇒ centred, so a legacy session without the field restores unchanged.
Optional ReadonlyfaderReadonlyidOptional ReadonlyinputsSource → level into this matrix output.
Optional ReadonlymuteThe matrix strip's own MUTE (#146, ADR 0017 layer 2 — a matrix is an output controlled like main). Absent ⇒ un-muted, so a pre-matrix-strip session (which never wrote this) restores exactly as before.
Optional Readonlyname
A matrix node: a mix of buses/groups feeding a matrix output.