Apple Logic Pro 7 - Manual (Page 255)

Chapter 5 The Environment 255
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 on 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 forward to the last output.
Meta Event Faders
Meta faders generate special events called meta events, which are used to control
certain Logic functions, but have no MIDI meaning, and are never sent to the MIDI
output.
In some cases (such as Goto Screenset, Goto Song 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 therefore alter their effect. 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:
Meta Event Controlled Logic function
46 Assign Alias
49 Goto Screenset
50 Goto Song
51 Goto marker
52 Stop playback
96 Set fader range minimum
97 Set fader range maximum
98 Set the fader value without sending.
99 Bang! Causes the fader to re-send its current value. The bang data value can be used
to make the fader to 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.
100 Tempo Control (see “Real Time Tempo Fader” on page 603)
122 Set transformer map value for the currently selected map position.
123 Select transformer map position.
124 Set transformer condition maximum (bottom) parameter, if any. (This applies to all
conditions not set to All).
125 Set transformer condition minimum (top) parameter, if any. (This applies to all
conditions not set to All).