Ngangam has three vowel lengths—short, long weak, and long strong. The long weak vowels shorten in some cases, while the long strong vowels are always realized as long.[6]
Tones
Ngangam has three phonemic tones: high, mid, and low.[4]
Bakpa, Mimboabe (2014). Etude du ngbem, parler gangam de Koumongou: Description et analyse comparative. Beiträge zur Afrikaforschung (in French). Vol. 54. Münster: LIT. ISBN9783643122612.
Higdon, Lee M. (1998). "The line of importance in Gangam narrative discourse". Cahiers Voltaïques / Gur Papers. 3: 45–53.
Higdon, Lee M. (1996). Tense, aspect, and modality in Gangam narrative and hortatory discourse (MA thesis). Arlington, TX: University of Texas.
Reimer, A. Jeanette (1983). "Etude préliminaire sur le système des genres nominaux en gangam". In Nicole, Jacques (ed.). Etudes linguistiques préliminaires en quelques langues du Togo. Lomé, Togo: SIL International. pp. 81–97.