Mentioned only by Grove, who does not define it, but only cites three examples: Carillon, Claron and Hörnli. All we can assume is that it is some sort of mixture containing a Tierce rank.

Tierce Mixture V-IX, Grand Choeur; Chancel Organ, St. Thomas, New York City, New York, USA; Aeolian-Skinner (see above). Tierce Mixture V-IX, Bombarde; Cathedral of St. John the Divine, New York City, New York, USA; Aeolian-Skinner 1954 (see above).

Tierce Mixture V-IX (1'), Bombarde; Auditorium, Community of Christ (RLDS) World Headquarters Complex, Independence, Missouri, USA; Casavant 1993. Tierce Mixture V, Great; Town Hall, Leeds, England; Gray & Davison 1859.

Tierce Mixture III, Enclosed Great; Cadet Chapel, United States Military Academy, West Point, New York, USA; Moller 1911. Tierce Mixture III (10, 17, 22), Brass Chorus; Convention Hall, Atlantic City, New Jersey, USA; Midmer-Losh 1929-32.