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.
A MIDI files do not contain any audio. A MIDI file play sounds you have on your computer. You have to use a application that play MIDI files and set it to use sound on your computer. Else you can't hear any sound, because there are'nt any. Also your application/ system shall be directed to your soundcard. Your DAW uses sounds you have or audiofiles.