Apple Logic Pro 7 - Manual (Page 257)

Chapter 5 The Environment 257
You can also specify SysEx as an In definition, but this has limited usefulness because
the incoming message (presumably SysEx) must be very short, in order to be
recognized. This is a side-effect of the fact that SysEx messages can be of any length,
and Logic must break them into small packets to avoid interrupting other MIDI
activities.
Opening the Fader Event Editor window
When you set a fader’s Out or In definition to SysEx, its event list window opens up. You
can also open this window at any time by double-clicking on the word SysEx in the
fader’s Parameter box.
An important thing to remember about the SysEx fader is that only events that are
selected when the event list window is closed will have their value altered by the fader
value. Events that are not selected will be sent exactly as they appear in the window.
Selected events will have the value shown in the Val column of the list altered, if they
are normal MIDI events (controllers, program change, aftertouch, and so on). For SysEx
messages, you can set both; which byte(s) are altered, and the format (MSB/LSB, BCD,
nibbles, and so on) that the value will take. You can also specify a checksum format, if
necessary.
Creating a SysEx Message
There are two ways of entering SysEx messages in the SysEx fader’s event list. One way
is to have the fader “learn” the sysex string. To do this, you manually send the
corresponding SysEx message from your synthesizer, using its onboard controls.
• If you haven’t already done so, connect the MIDI output of the synthesizer to the
MIDI input of your computer.
• Click the MIDI In button at the top left of the SysEx event list. If the button is red, this
means it is ready to receive incoming MIDI data.
• Alter the parameter on your device. The corresponding SysEx message will be
displayed and the MIDI In button will switch off automatically.
Another way is to type the sysex string into the event list. (Consult your MIDI device
manual for SysEx documentation). Use of this method qualifies you as a confirmed MIDI
freak. Here’s how you go about it:
• Command-click the SysEx button. A generic SysEx message appears.