Apple Logic Express 8 - Manual (Page 947)

Chapter 38 Working in the Environment 947
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All MIDI events coming from the Physical Input object are filtered. This is the same as
turning off all events coming from Logic Express (from regions or the Environment).
Use this filter mode to prevent MIDI feedback, by blocking incoming MIDI events from
being sent back out.
Shot
When the fader is moved with the mouse, only the final value (the value when the
mouse button is released) is sent.
14 Bit
 Used in conjunction with pitch bend, this allows 2-byte (fine tuning) pitch bend
events.
 Used with controller messages, this causes the fader to send two MIDI controller
messages—one for the MSB (Most Significant Byte) and one for the LSB (Least
Significant Byte).
Note: The fader’s Input and Output definitions must be the same or the 14 Bit setting
will not work.
For controllers, the MSB uses the Input definition controller number, and the LSB uses
the controller number 32 higher. This conforms to the MIDI standard for sending 14-bit
controller data.
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.
Feedback
When the Feedback parameter is turned off (unchecked), the fader will automatically
prevent 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.
Checking the Feedback checkbox will allow this.