Amplifiers boost the signal of an audio signal to make it louder.

Compression reduces the dynamic range of audio by reducing the level of the loudest parts.

Delay repeats audio at a decreasing volume each time, creating an echo effect.

Distortion is used to alter the sound of instruments, usually by increasing their gain, producing a "fuzzy", "growling", or "gritty" tone.

Filters are used to boost or diminish certain frequency ranges.

Gates control the dynamic range of audio by removing anything below or above a certain threshold.

Limiters are used to decrease the loudest parts of audio without affecting everything else.

Meters are used to measure different aspects of an audio signal.

These are plugins or programs that output information to a MIDI channel.

Modulation plugins control certain parameters over time based on controls within the plugin.

Reverb simulates placing a sound in a reverberant, or echoey space.