To combine two or more elements. In audio we mix signals from a number of different sources together to form a complete performance. A stereo mix combines two or more audio signals into a left-right pair of audio signals. Mix can also refer to the control on an effects-processor that controls the amount of effect versus the amount of unprocessed signal sent to the output of the processor. It is also possible to add or mix data streams such as MIDI, although that is usually more correctly referred to as merging.