Mid/side processing allows for independent control over the mid and side channels of a stereo signal, enabling engineers to adjust the stereo width, depth, and localization of various elements in the mix.

The mid channel contains the sum of the left and right channels, resulting in a mono signal. The side channel contains the difference between the left and right channels, resulting in a stereo signal.

The mid channel typically covers the lower frequencies, up to around 1 kHz, where most of the mono information is concentrated.

The side channel typically covers the higher frequencies, from around 1 kHz to 10 kHz, where most of the stereo information is concentrated.

A mid/side EQ allows for independent control over the mid and side channels, enabling engineers to adjust the stereo width, depth, and localization of various elements in the mix.

A mid/side compressor allows for independent control over the mid and side channels, enabling engineers to control the dynamics of the mono and stereo components of the mix separately.

A mid/side limiter allows for independent control over the mid and side channels, enabling engineers to prevent clipping in both the mono and stereo components of the mix.

A mid/side expander allows for independent control over the mid and side channels, enabling engineers to increase the stereo width of the mix by expanding the side channel.

A mid/side reverb allows for independent control over the mid and side channels, enabling engineers to add ambience to the mono and stereo components of the mix separately.

A mid/side delay allows for independent control over the mid and side channels, enabling engineers to add delay to the mono and stereo components of the mix separately.

A mid/side chorus allows for independent control over the mid and side channels, enabling engineers to add chorus to the mono and stereo components of the mix separately.

A mid/side flanger allows for independent control over the mid and side channels, enabling engineers to add flanging to the mono and stereo components of the mix separately.

A mid/side phaser allows for independent control over the mid and side channels, enabling engineers to add phasing to the mono and stereo components of the mix separately.

A mid/side tremolo allows for independent control over the mid and side channels, enabling engineers to add tremolo to the mono and stereo components of the mix separately.

A mid/side vibrato allows for independent control over the mid and side channels, enabling engineers to add vibrato to the mono and stereo components of the mix separately.