The theoretical significance of the Bamileke-Dschang tone system has been evident since Tadadjeu (1974) first pointed out the unusual tonal oppositions found in this language. Whereas the majority of languages with tonal downstep permit this entity (!) only between high (or, perhaps more generally, only between non-low) tones, Dschang contrasts H and !H after both high (H) and low (L) tones and also contrasts L and ! L tones as well. The detailed account provided in Hyman & Tadadjeu (1976) has led to further comments, reactions and reanalyses, including Clark (1979), Hyman (1979), Watters Anderson (1980), Stewart (1981), Hyman (1982), Pulleyblank (1982, 1983), and an exchange of letters between M. Halle, S. C. Anderson and myself in 1981–1982.