Apple Logic Pro 9 - Manual (Page 1108)

Data values of 126 and 127 have a special effect.
• An event with a value of 127 increases the output number. If you’re on the switcher’s
last output when this event is received, you’ll jump back to the first output. This is just
like clicking the fader.
• An event with a value of 126 decreases the output number. If you’re on the switcher’s
first output when this event is received, you’ll jump to the last output.
Meta Event Faders
Meta faders generate special meta events, which are used to control certain Logic Pro
functions, but have no MIDI meaning, and are never sent to the MIDI output.
In some cases (such as Go to Screenset, Go to Project, and so on), you do not need to
cable meta faders into another object for them to work. Even in these cases, you can use
cabling to process meta events in the Environment, and alter their effect.
However in the majority of cases (Set fader range minimum, Bang!, Set Transformer
Operation Minimum, and so on), the meta fader must be cabled to the object being
affected.
Here’s a quick summary of the currently implemented meta events that can be generated
by faders:
Controlled Logic Pro function Meta event
Assign Alias 46
Go to Screenset 49
Go to Project 50
Go to Marker 51
Stop Playback 52
Set fader range minimum 96
Set fader range maximum 97
Set the fader value without sending 98
Bang! Causes the fader to resend its current value. The bang data
value can be used to make the fader increment-without-rollover
(127), decrement-without-rollover (125), increment-with-rollover
(123) or decrement-with-rollover (121). Use values one less than
those shown to have the bang passed through to all connected
faders. 99
Tempo Control (See Using the Tempo Fader .) 100
Set transformer map value for the currently selected map position 122
Select transformer map position 123
Set transformer condition maximum (bottom) parameter, if any.
(This applies to all conditions not set to All.) 124
1108 Chapter 37 Environment Objects Reference