Nyole (also LoNyole, Lunyole, Nyuli) is a Bantu language spoken by the Banyole in Butaleja District, Uganda.
Then, given the acoustic similarity of [h] and breathy voice to nasalization, the sound change progressed as [h] → [h̃] → [ŋ].
The velar place of articulation development is due to velar nasals being the least perceptible of the nasals and its marginal status in (pre-)Nyole and other Bantu languages.
In closely related neighboring languages, *p developed variously into /h/ or /w/ or was deleted.
This historical development results in so-called "crazy" alternations, like /n/ + /ŋ/ resulting in /p/ as in the following: In the above two words, when the first person singular subject prefix /n-/ is added to the stem starting with /ŋ/, the initial consonant surfaces as /p/.