10.6

955Logic Pro User Guide
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 Aftertouch, Poly Aftertouch, 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. In Logic Pro, 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.
• Value Byte Format: The following table outlines the resulting data format of the value
option you send: (The unused bits of the transfer in nibbles (X in 0XXXNNNN) are
sent with the information at the relevant positions of the SysEx strings. If you want to
transfer these deleted bits, you need to enter zeros in the SysEx string.)
Value option Result
Auto The value is sent as one byte if the value range maximum is 127 or less. If
the maximum is higher than 127, the value is sent as two bytes, the MSB
(most significant byte) first.
One Byte The value is sent as one byte.
MSB/LSB The value is sent in two bytes, with the MSB (most significant byte) first.
LSB/MSB The value is sent in two bytes, with the LSB (least significant byte) first.
BCD 4 LSB The value is sent as Binary Coded Decimal in four bytes, in the order 1, 10,
100, 1000.
BCD 4 MSB The value is sent as Binary Coded Decimal in four bytes, in the order 1000,
100, 10, 1.
2 Nibbles L The value is sent in two nibbles, with the least significant nibble first.