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.
The most commonly used MIDI message is a note-on or note-off message. A note-on message is created when pressing a key (or pad), and a note-off message is created upon release. This MIDI note message tells you what note was played, how hard the note was hit, and what MIDI channel the note was played on.