As the plane shot up only a faint hum sounded.

Just the faint hum of the computer which he left on permanently.

There was only a faint hum of noise around them.

He caught the faint hum, and the sound sent his heart racing.

There was a faint hum and the door slid open without a sound.

The only answer was a faint hum across the airways.

There was a hum rising in the air, faint and sweet.

The only sound is the faint hum of the ship's system.

Just a faint hum, the air, the lights, or the computer.

I could hear the faint hum of the refrigerator in the kitchen.