Audio (noun)

1. Sound, especially speech or music recorded or broadcast.
2. The equipment used to play, record, or amplify sound.

Origin:

Late 19th century: from latin audio "i hear", from audire "hear".

Examples:

1. The audio of the recording was not clear.
2. The audio book was a bestseller.
3. He had to adjust the audio settings on his computer.
4. The audio system in the car was top of the line.
5. The audio tour was included in the admission fee.