Controlling the condition and, Operation values via meta events – Apple Logic Pro 8 User Manual
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Chapter 39
Working in the Environment
 The channel controls the action to be taken:
 Channel 1: The changed SysEx message is sent.
 Channel 2: The changed SysEx message is not sent.
 Channel 3: The unchanged SysEx message is sent.
 Channels 4 to 16: No meaning (reserved for future use).
The “Filter non-matching” checkbox prevents incoming MIDI events (that don’t control
the SysEx message) from being passed through. Typically, you will want this feature
turned on, to prevent interloping controller data from invading the SysEx data stream.
Track Automation Splitter (true → to cable)
If the condition matches, incoming events will be sent to the track automation of the
object connected to the top cable of the transformer—after passing through the
Operation field. With the appropriate Operation field settings, incoming MIDI data is
transformed into Fader event data—allowing the automation of any possible
parameter of the connected Mixer object. Exception: Channel volume and channel pan
uses Control events.
Defining Conditions and Operations
The conditions and operations are the same as those found in the Transform window.
For more information, see “
Editing MIDI Events in the Transform Window
The only differences arise from the fact that a transformer objects work in real time and
therefore, position and note length have no useful meaning.
Editing Pitch Bend Events
A transformer object can process 14-bit pitch bend events, which contain two discrete
data bytes: If byte 1 is changed (by addition or scaling with the -1- operation), the
change will also affect the second byte.
Set the Data Byte 2 operation to Thru to ensure that 14-bit pitch bend data is processed
properly.
Controlling the Condition and Operation Values via Meta Events
You can control the values of any transformer conditions or operations by using meta
events. Meta events are internal Logic Pro messages—their form is similar to MIDI
controller events, but they have no MIDI meaning, they never leave Logic Pro, and
control internal Logic Pro parameters.
Like MIDI controller events, meta events have two data values: The first one indicates
the type of meta event (49 to 127, but not all are used), and the second one is the event
value (0 to 127).
Meta events 122 to 127 affect transformer parameters.
 Meta event #127 sets the first (top) operation value.
 Meta event #126 sets the second (bottom) operation value (if available).