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.
Synthesizers can be connected to PCs and other synthesizers using MIDI (Musical Instrument Digital Interface). The sounds are triggered by someone playing the synthesizer's keyboard, by it's sequencer, or by an external triggering via MIDI.