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For messages containing only a Lo7 placeholder, the value is treated as 7 bit. For messages
containing both a Lo7 and Hi7 placeholder, the value is treated as 14 bit. The order of
Lo7 and Hi7 is honored, and there may be constant bytes in between. This allows you to
define Control Change LSB and MSB portions. For example, B0 08 Hi7 B0 28 Lo7 indicates
a 14-bit message.
Note: When you enter multiple MIDI messages, always enter each message completely,
being sure to repeat the status byte, even if it’s the same. It may help to write out the
message to ensure that the correct byte works, as you can’t know what status the
previously sent message had.
For messages containing neither Lo7 nor Hi7 placeholders, Logic Pro assumes an incoming
value of 1. This is typical for pressed or released buttons. Also see “Multiply Field” in
Editing Value Parameters in Expert View.
Touch/Release Field
Enter an integer value to use the incoming MIDI message for status changes of the
destination parameter from touched to released, or vice versa. A non-zero value means
touched; a value of 0 means released. The messages are shown and edited in the same
way as the Value Change field.
Note: The Touch/Release setting only applies to the Channel Strip assignment class, and
to parameters that can be automated.
Editing Value Parameters in Expert View
The parameters in this section let you control different aspects of the values for incoming
MIDI messages.
Min and Max Fields
Enter an integer value to set the minimum and maximum range for incoming values
represented by Lo7 and Hi7. Typically, the minimum defaults to 0, and the maximum
defaults to 127. Some control surfaces (such as the CM Labs Motor Mix) may use the same
message, with different value ranges, for different controls. For more specific information,
refer to the documentation that came with your device.
Format Pop-Up Menu
Choose the encoding format for negative values in the 7-bit portions sent over MIDI. The
choices are:
• Unsigned: No negative values are possible. The full 7- or 14-bit range is treated as a
positive number. The value range is 0 to 127 (7 bit) or 0 to 16383 (14 bit).
• 2’s complement: If the most significant bit is set, the value is negative. To obtain the
absolute value, invert all bits and add 1. The value range is from –128 (7 bit) to 127 or
–8192 to 8191 (14 bit).
56 Chapter 2 Customizing Controller Assignments