In the context of audio production, what is the result of 'filtering'?

Filtering in audio production specifically refers to the process of removing unwanted frequencies from an audio signal. This technique is commonly used to enhance the clarity and quality of sound by eliminating noise, hum, or other frequencies that may detract from the desired audio. For example, a low-pass filter allows lower frequencies to pass through while attenuating those that are higher, effectively cleaning up the audio. Filtering can help in shaping the sound, ensuring that specific elements stand out in a mix, which is crucial for achieving a polished final product.

The other choices relate to different aspects of audio manipulation but do not define filtering. Improving audio resolution pertains to enhancing the clarity or detail of the sound, altering audio tempo involves changing the speed or rate of audio playback, and expanding audio tracks refers to increasing the number of tracks or layers in a composition. These actions play important roles in audio production but do not specifically involve the removal of frequencies, which is the essence of filtering.