At its simplest level, an audio device used to add (combine or sum) multiple inputs into one or two outputs, complete with level controls on all inputs as well as routing and monitoring capabilities designed to get signals on and off of one or more recording machines. From here signal processing is added to each of the inputs and outputs until behemoth monsters with as many as 80 (or more) inputs are created – at a cost of around 10-20 kilo-bucks per input for fully digitized and automated boards. At these price points a mixer becomes a recording console. (Sometimes referred to as a Desk or Board.)