Meanings of steady buzz in English

Outside, she could hear the steady buzz of the locusts in the trees.

Billie Warren heard the steady buzz of a saw and later the ringing strokes of an axe.

All was in total darkness, as he had left it, and there still arose, as at the former time, the steady buzz of many snores.

Just as the frequency of the clicks reached its highest peak-almosta steady buzz-alarge fireball, described by them as "spectacular," flashed across the sky.