What is a sound mixer primarily used for?

A sound mixer is primarily utilized for changing the routing and level of different audio signals. In a mixing context, a sound mixer is an essential tool that allows audio professionals to control multiple audio inputs, adjust their levels, equalization, and dynamics, and create a final stereo or multichannel output. This process is vital in various settings such as music production, broadcasting, and live events, where balancing different audio sources is crucial for achieving the desired sound quality.

The ability to manipulate audio signals effectively through a sound mixer ensures that each element—be it vocals, instruments, or effects—can be blended seamlessly into a cohesive audio experience. By controlling the levels and routing, the mixer facilitates the adjustment of each audio source in relation to others, leading to optimal sound output.

Other options like storing audio recordings, enhancing microphone sensitivity, and reducing background noise, while relevant to audio production, do not specifically represent the primary function of a sound mixer. Storing audio recordings pertains more to digital audio workstations or recording devices, enhancing microphone sensitivity relates to microphone design and technology, and reducing background noise involves techniques and equipment external to a sound mixing setup. Therefore, the role of a sound mixer is distinctively centered around the manipulation and balance of audio signals.