MIDI Show Control, or MSC, is a significant Real Time System Exclusive extension of the international Musical Instrument Digital Interface (MIDI) standard. MSC enables all types of entertainment equipment to easily communicate with each other through the process of show control.
The MIDI Show Control protocol is an industry standard ratified by the MIDI Manufacturers Association in 1991 which allows all types of entertainment control devices to talk with each other and with computers to perform show control functions in live and canned entertainment applications. Just like musical MIDI, MSC does not transmit the actual show media - it simply transmits digital information about a multimedia performance.
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How MSC works [link]
When any cue is called by a user (typically a stage manager) and/or preprogrammed timeline in a show control software application, the show controller transmits one or more MSC messages from its 'MIDI Out' port. A typical MSC message sequence is:
- the user just called a cue
- the cue is for lighting device 3
- the cue is number 45.8
- the cue is in cue list 7
MSC messages are serially transmitted in the same way as musical messages and are fully compatible with all conventional MIDI hardware, however many modern MSC devices now utilize Ethernet communications for higher bandwidth and the flexibility afforded by networks. Other performance parameters are also transmitted such as lighting desk submaster settings using MSC SET messages.
All cues that a media control device is capable of playing are assigned MSC messages within the Show Controller's cue list and they are transmitted from its 'MIDI Out' port at the appropriate show time, depending on the actions of the user and the show controller's internally timed sequences.
All MSC compatible instruments follow the MSC specification and thus transmit identical MSC messages for identical MSC events such as the playing of a certain cue on the media controller. Since they follow a published standard, all MSC devices can communicate with and understand each other, as well as with computers which have been programmed to understand MSC messages using the MSC Command Set. All MSC compatible instruments have a built-in MIDI interface and many now follow one of the various MIDI-over-Ethernet protocols.
History [link]
To create the MSC spec, Charlie Richmond headed the USITT MIDI Forum on their Callboard Network in 1990, which included developers and designers from the theatre sound and lighting industry from around the world. This Forum created the MSC standard between January and September, 1990. This was ratified by the MIDI Manufacturers Association (MMA) in January 1991, and the Japan MIDI Standards Committee (JMSC) later that year, becoming a part of the standard MIDI specification in August, 1991. The first show to fully utilize the MSC specification was the Magic Kingdom Parade at Walt Disney World's Magic Kingdom in September 1991.
MIDI Show Control software [link]
See also [link]
External links [link]
- MIDI Manufacturers Association
- MSC 1.0 PDF (still a valid subset, is now superseded by V1.1)
- The Show Control Mailing List subscription page.
https://wn.com/MIDI_Show_Control
Show control
Show control is the use of automation technology to link together and operate multiple entertainment control systems in a coordinated manner. It is distinguished from entertainment control (a term much less common than its specific forms, e.g. lighting control), which coordinates elements within a single entertainment discipline such as lighting, sound, video, rigging or pyrotechnics. An example of show control would be linking a video segment with a number of lighting cues, or having a sound track trigger animatronic movements -- or all of these combined. Shows with or without live actors almost invariably incorporate entertainment control technology and usually benefit from show control to operate these subsystems simultaneously or independently. Shows which are performed once or only a few times are often not considered candidates for show control since considerable preplanning and programming is usually required, but this may change as the technology, ease of operation and programming of show control software and systems matures.
