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 is nothing more than data -- a set of instructions. MIDI data contains a list of events or messages that tell an electronic device (musical instrument, computer sound card, cell phone, et cetera) how to generate a certain sound.Here are a few examples of typical MIDI messages:1  Note On signals that a key has been pressed or a note on another instrument (like a MIDI guitar or clarinet) has been played. 2  The Note On message includes instructions for what key was pressed and at what velocity (how hard the note was played).nd since MIDI files don't contain sampled audio like MP3 or WAV files, they're comparatively much smaller than audio files. A minute of compressed audio adds up to around 10Mb (megabytes) of data, while a minute of sound translated into MIDI only takes up 10Kb (kilobytes) [source: MIDI Manufacturers Association ].