Control change events are used to transfer MIDI controller information (modulation, sustain, volume, and pan, for example) to software instruments or external MIDI keyboards and modules.
Ch(annel): MIDI channel of an event from 1 to 16.
Num(ber): The number of the controller. Each MIDI controller (such as the modulation wheel or sustain pedal) is assigned a specific Continuous Controller (CC) number (CC#1 or CC#64, respectively). This can vary from device to device. Several controllers (apart from the two above) are defined in the same way by most manufacturers; these standardized controllers include volume (CC#7) and pan (CC#10).
Val(ue): Value of the controller. Continuous controllers have a range of 0 to 127. Switch controllers (CC#64–CC#90) transfer two states: off (val = 0) and on (any value between 1 and 127).
Length/Info: Shows the name of standardized controllers defined in the MIDI Specification.