The purpose of a test tone in audio production is to:

The purpose of a test tone in audio production is to check audio equipment settings. Test tones are standardized noises, usually at specific frequencies, that are played through an audio system to allow technicians and engineers to assess and calibrate the equipment. By using a test tone, audio professionals can ensure that their monitors are accurately reproducing sounds, verify that the levels of different channels are balanced, and identify any issues with frequency response or distortion.

Using a test tone helps establish a baseline for sound performance, ensuring that everything from microphones to speakers is operating effectively within the desired parameters. This practice is essential for maintaining high sound quality in recordings or live audio situations. Other answer choices are unrelated to the actual function of a test tone, emphasizing the importance of proper audio testing in production.