Where does “magtunog” come from?

magtunog (Bikol Central) comes from Tagalog tunog, from Proto-Philippine *tunuʀ.

Ancestry of “magtunog”, step by step

Step	Language	Word	Meaning
1	Tagalog	tunog	sound; ring, sound of a bell; tone, quality of a...
2	Proto-Philippine	*tunuʀ	—