(Often abbreviated CC, while the correct term is "Control Change") A category of MIDI messages which are used to convey performance or patch data for parameters other than those which have their own dedicated message types (note on, note off, aftertouch, polyphonic aftertouch, pitch bend, and program change). The continuous controller message format contains a controller number and a seven-bit value. 128 controller numbers are possible, but eight are reserved for special purposes, leaving 120 available. The standard originally assigned meanings to only a few of these, notably mod wheel which is assigned to continuous controller #1. However, subsequent revisions have assigned meanings to many of them, and divided the possible numbers into ranges for different purposes: