MIDI functions
The Pearl can respond to or output MIDI note information which
emulates certain buttons being pressed or faders being moved. The
console can also respond to MIDI Timecode, which is used with script
files.
If you want to know more about MIDI, a good book to read is MIDI
Systems and Control by Francis Rumsey; Published by Focal Press,
ISBN 0-240-513000-2. Thereās also a huge amount of information
available on the Internet, try searching for āMIDI specificationā.
The MIDI mode is set on the User Settings menu to be MIDI master
(outputs MIDI when you turn on playbacks), MIDI slave (responds to
MIDI) or MIDI disabled. The MIDI channel the Pearl will respond to is
also set on this menu (note that you need to add 1 to the number
displayed by the Pearl to get the actual MIDI channel number).
13.2.1 What a MIDI command looks like
The normal MIDI command is: STATUS BYTE1 BYTE2
Or in binary, 1cccnnnn 0xxxxxxx 0yyyyyyy
ccc = the MIDI command (note on, program change etc)
nnnn = the MIDI channel number (set on the User Settings
menu).
xxxxxxx and yyyyyyy are the data bytes.
MIDI often works in ārunning statusā mode. If a lot of the same type of
command is being sent (lots of note onās etc.) then the status byte can
be missed out. The receiver knows that if it doesnāt get a status byte, it
just has to run with the last one it received.
13.2.2 MIDI commands used by the Pearl
The Pearl uses standard MIDI commands. The usual name for these is
given in italics. All commands are given in hexadecimal notation ($9n),
where ānā is the MIDI channel number. So a note on command for MIDI
channel 3 for example would be $92.
Set playback page : program change ($Cn xx)
Page 1 2 3 4 5 ⦠28 29 30
xx $00 $01 $02 $03 $04 ⦠$1B $1C $1D
example $Cn $02 Console changes to Page 3
Turn on a playback: note on ($9n pp ll)
Note number (pp) = playback number, from 0 - 14 (decimal)
Key velocity (ll) = playback level, from 0 - 127 (decimal). 127=Full
example $9n $03 $40 Playback Fader 4 at 50% level.
(Note that Playback Fader numbers start at zero, so subtract one from
the number on the console to get the MIDI note number).
Page 210 - 13. Other features
Pearl 2008 Manual - 16th July 2007
To Turn Off a playback, send a note on command with velocity=0. The
Pearl does not recognise MIDI note off ($8n) commands.
Stop/run/step a chase etc: after touch ($An pp cc)
Note number (pp) = playback number, from 0 - 19 (decimal)
Aftertouch value (cc) = control codes:
$00 stop chase
$01 run chase
$02 restart from step 1
$03 fade to next step using programmed fade times
$04 Snap directly to next step
13.2.3 MIDI Time Code
MIDI time code is used to synchronise Script Files with an external
music track.
Quarter-frame message types are fully supported and these follow the
standard format, which can be found in most MIDI handbooks. A
suitable EBU/LTC Timecode to Midi Timecode converter is manufactured
by JC Cooper Electronics whose address is 12500 Beatrice Street, Los
Angeles CA 90066 USA, or through Avolites UK.
You can now trigger many features of the console from external triggers. MIDI and DMX triggering are available. This powerful feature is explained in more detail in the Version 5 Titan manual. Briefly, to set up triggering, connect your external device then enter System mode and select the Triggers menu. Add a new Trigger mapping and give it a name. Add a trigger to the mapping then select what you wish to trigger. To trigger a fader or button on the console press it or move it. To trigger a specific playback, fixture, palette, group or macro toggle to Trigger Type [Item] and select the item to trigger. Now scroll though the list of available actions. Having selected an action or piece of hardware select [Ok]. Now choose MIDI or DMX triggering and, if using DMX triggering, select the DMX port. Then either enter the MIDI or DMX address to use as a stimulus or simply generate the stimulus from your device, the console will learn the trigger and fill in the details for you. Now add the trigger. Repeat to add as many triggers as you wish.
Turn on a playback:
note on ($9n pp ll)Note number (pp) = playback number, from 0 - 14 (decimal)
Key velocity (ll) = playback level, from 0 - 127 (decimal). 127=Full
example $9n $03 $40 Playback Fader 4 at 50% level.
(Note that Playback Fader numbers start at zero, so subtract one from
the number on the console to get the MIDI note number).
Page 210 - 13. Other features
Pearl 2008 Manual - 16th July 2007
To Turn Off a playback, send a note on command with velocity=0
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13:48:18.138 From IAC Bus 1 Note On 1 $01 $7F