C m7add11 — E9 Pedal Steel
C m7add11 has no bar or slant position on the E9 Pedal Steel with the pedals up.
C m7add11 stacks C – Eb – F – G – Bb, and with every pedal up and every lever at rest no bar position on the E9 Pedal Steel sounds that set: at every fret, and on every short slant, a tone it needs is missing or too few strings carry it.
A pedal steel does not stop there. With B pedal engaged, a straight bar at fret 1 spells it — one change is the fewest it takes, and the copedent page lists every position, 7 in all.