Apple Logic Pro X - Manual (Page 801)

Chapter 23 Work in the Environment 801
Although you can have any number of messages (of any kind) in the SysEx fader’s Event List,
there is only one fader value, and all selected messages adopt this value.
You can use a similar method to create any kind of MIDI or meta event in the SysEx fader
window. Command-clicking any of the eight event type buttons (Note, Program Number, Pitch
Bend, Controller, Channel Pressure, Poly Pressure, SysEx, and Meta Event) creates a new event of
that type. Meta events can be created by using the expanded view button, featuring the 0’s and
1’s on its face.
The terms SUM (for the checksum) and VAL (for the fader value) being sent are displayed within
the SysEx string.
Set the checksum and value of a SysEx event
1 Select the events you want to alter.
2 Choose options from the Checksum and Value pop-up menus (found in the lower-right corner of
the window) to set the format of these bytes.
•
Checksum Format: A checksum can be created in any of the following formats:
•
Roland
•
Yamaha
•
Regular Checksum
•
2’s complement
•
1’s complement
If you don’t know which one works with your MIDI device, try “off” (= no checksum) first or “2’s
complement.”
•
Value Byte Position: Position allows you to determine the position of the value byte. This
position is specified in bytes, counted from the end of the message: “last” refers to the position
directly before the EOX byte, “Last-1” indicates the byte before that, and so on. Auto ensures
that the value byte is inserted at the last position in the SysEx string if no checksum was
selected, or—if a checksum value was entered—that the value is inserted as the second-
to-last byte.