Fly buzzing sound effects

One insect passing close and drifting away again. The change in level is what puts the fly in the room, because a flat buzz just sits in the speakers.

Wing beats interrupted by the body hitting glass. Those small dry taps are the detail that makes it a trapped insect rather than a passing one.

Hundreds of separate wing beats overlapping into a mass. Written as its unit event, because prompting the swarm as one sound returns a machine drone.

The beats stopping dead with one small tap. A landing is the only fly sound with a clean edit point in it, so it is the one you can cut to a frame.

A larger, heavier insect at a lower pitch. Size lives entirely in the beat rate, so slowing it down changes the animal without changing anything else.

The same mass with the sharp edge taken off it. Derived from a close take rather than a quiet one, which is how distance actually behaves.