Typically aux sends are used to send some of the input signal to an effect such as reverb, but they can be used creatively for other purposes. Small mixers may only have adjustments for bass and treble, while larger boards may provide bass, treble, mid-range, and adjustable range controls. These adjustable range controls are called parametric equalizers , and allows the user to choose not only to boost or cut a frequency range, but to choose which range to work with. Equalizer controls function much like the familiar bass and treble knobs found on stereos. It is common to use an equalizer to improve or alter the sound of an input.
Most mixers are capable of handling stereo signals.
This is an extremely useful feature, as it can make for more realistic effects. For example, if a sound is supposed to be coming from one side of the stage, the pan control can be used so only the speaker on that side is used. It should be noted that on boards that have multiple outputs, the control is usually set up to pan between even and odd sets of outputs. The manual for a sound board should always be consulted to see how this feature is implemented to avoid any unpleasant last-minute surprises. The most prominent part of a mixer is probably the set of channel faders , generally located at the bottom of the board.