Apple Logic Pro X - Manual (Page 795)

Chapter 23 Work in the Environment 795
When this filter setting is chosen, the fader’s Range can be set to a maximum value of 16,383.
A fader value of 8192 represents no pitch bend.
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Feedback: When the Feedback parameter is turned off (unselected), the fader automatically
prevents feedback loops resulting from circular cabling. (The fader remembers when a specific
MIDI event has passed through it and will not allow it to pass through again.)
In some instances, you may want to enable feedback—to allow a MIDI event to change a cable
switcher’s position after it has passed through the switch, for example. Selecting the Feedback
checkbox will allow this behavior.
Vector fader
Vector faders function like joysticks. They can be moved in two dimensions: up and down and
left and right. Each dimension generates its own MIDI events, so each time you change the
position of the crosshair with the mouse, two MIDI events are sent.
Most faders have Input and Output definitions, which determine the MIDI events sent by the
fader (Output), and those it reacts to (Input). (See
Fader functions: range, value as on page 794.)
For vector faders, Input and Output definitions are replaced with Vert and Horz definitions, which
determine the MIDI events that correspond to vertical and horizontal motion. If corresponding
MIDI events are received by the vector style fader, its crosshair display updates accordingly.
If you set a vector fader’s Vert and Horz definitions to the same MIDI event (the same MIDI
controller and channel), the vector fader sends out the same MIDI event each time the
crosshair is moved, but on four consecutive MIDI channels, starting with the channel set in the
Vert definition.
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Upper-left for the lowest channel (channel 3, for example)
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Upper-right (channel 4)
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Lower-left (channel 5)
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Lower-right (channel 6)