Apple Logic Express 9 - Manual (Page 717)

Poly Pressure Events
Poly(phonic) pressure events are generated by mechanical pressure sensors beneath
each individual key on some MIDI keyboards. The resulting sound modulation only affects
the particular note that is pressed harder (after the initial keystrike). Only a few keyboards
offer this capability.
• Num(ber): Displays the MIDI note name (C3, G4, and so on).
• Val(ue): Displays the amount of pressure on the key (0 to 127).
SysEx Events
System exclusive data (SysEx) is unique to individual MIDI devices. You can record these
events by using the dump utilities of your synthesizers. This allows you to save patch
information, or other data, outside of the MIDI device (in a Logic project or MIDI file). The
arrows in front and behind EOX are used to add or remove bytes.
Warning: Editing SysEx Events requires a thorough understanding of the data format
used by the MIDI device in question. Incorrect edits can lead to the corruption, or loss,
of sound or other data.
SysEx Data in Hex Format
You can choose whether SysEx data is displayed in hexadecimal or decimal, in the Event
List or the SysEx fader editors, with the View > SysEx in Hex Format command.
Hexadecimal digits are preceded by a $ symbol in Logic Express.
For more information on manually programming a SysEx message, see Working with
SysEx Faders .
717 Chapter 25 Editing MIDI Events in the Event List