Abstract: This metric is the ratio of the maintenance personnel who are actively doing the maintenance work (direct) to the maintenance personnel supporting the maintenance work (indirect). Direct personnel include those workers in the maintenance department that repair, maintain, modify or calibrate equipment.
MIDI (Musical Instrument Digital Interface) is a protocol designed for recording and playing back music on digital synthesizers that is supported by many makes of personal computer sound cards. Originally intended to control one keyboard from another, it was quickly adopted for the personal computer.
MIDI plays an important role in the world of the music sequencer, which is why you commonly see them called 'MIDI sequencers'. The range of MIDI controls you get will vary between sequencing devices and programs, but you will find the same basic functions across all of them: transport controls: play/stop/FF/RWD.