Do you accept the '-ing' words as sounds?
1. the ringing of a telephone
2. the strumming of a guitar
3. the screeching of brakes
4. the howling of a wolf
The root words are certainly describing sounds. "Onomatopoeia" is the technical term for words that imitate the sound they are naming.
Adding the "-ing" is not necessary, but not wrong. You could just as easily say "the ring of the phone" or "the screech of the brakes."
(And "howling" is a noun as used here.)