What is a common reason for using a compression tool in audio processing?

Using a compression tool in audio processing is primarily aimed at managing dynamic range and maintaining consistent levels in an audio track. Dynamic range refers to the difference between the quietest and loudest parts of an audio signal. By applying a compressor, you can reduce the volume of the loudest peaks and bring up the volume of quieter sections, resulting in a more balanced sound overall. This is particularly useful in both music production and broadcasting, where consistent audio levels improve listener experience and ensure that no parts of the audio are too overwhelming or too soft.

The other options suggest outcomes that are not typical for compression tools. Increasing file size is usually not a function of compression; in fact, compression can often reduce file size. Making audio sound softer does not accurately reflect the function of a compressor, as it is used to control peaks rather than simply lower volume levels. Finally, creating complex sound waves is not a direct function of compression, which focuses more on leveling audio dynamics rather than altering the fundamental characteristics of sound waves.