Apple Logic Express 8 - Manual (Page 945)

Chapter 38 Working in the Environment 945
The Input and Output Definition Parameters
These are used to define the Input and Output parameters:
 Output (or Input): Defines the event type.
 Channel (1 to 16): Defines the MIDI channel of the event.
 -1- (0 to 127): Defines the first data byte of the event. In some cases, such as pitch
bend, this is an actual data value. In other cases (MIDI controllers), this indicates the
controller type (volume, pan, and so on, as examples). In other cases, such as
aftertouch, this byte is unused.
Setting the -1- Parameter and Fader Position
This section outlines each of the -1- parameter options, and explains how the fader
position affects them (for both the Input and Output definitions):
 Note On: The -1- parameter sets the pitch, and the fader position sets the velocity.
This is most useful as an Input definition—for trapping specific notes and converting
them to other MIDI events, or simply monitoring their velocity. If you move a fader
with an Output definition set to Note On, a note-off MIDI event will immediately
follow the note-on. This might be useful for creating onscreen drum pads from
button style faders, for example.
 P-Press: The -1- parameter sets the pitch, and the fader position sets the amount of
Poly Pressure (key pressure or polyphonic aftertouch).
 Control: The -1- parameter sets the MIDI controller number (the controller type), and
the fader position sets the controller value. The controller type can actually be
selected by name, via the pull-down menu that appears when you click-hold on the
-1- parameter.
 Program Change: The -1- parameter is ignored. The fader position determines the
program number.
 C-Press: The -1- parameter is ignored. The fader position sets the channel pressure
(monophonic aftertouch) amount.
 PitchBd: The -1- parameter sets the pitch bend LSB, and the fader position sets the
MSB. Typically, you would set the -1- parameter to 0, and use the fader to control the
coarse pitch bend amount. A -1- setting of 0, and a fader position of 64 results in no
pitch bend.
SysEx and Switcher/Meta are special functions of the faders.