Apple Logic Pro 7 User Manual download pdf (Page 253)

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Chapter 5 The Environment 253

Vector Fader

Vector faders function like joysticks—they can be moved in two dimensions: up/down

and right/left. 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 In and Out definitions (see “Fader Functions: Range, Val as” on

page 251) which determine the MIDI events sent by the fader (Out), and those it reacts

to (In). The vector style fader replaces these with Vert and Horz definitions, which

determine the MIDI events that correspond to vertical and horizontal motion. If you

cable corresponding MIDI events into the vector fader, it’s crosshair display will update

accordingly.

4-Channel vector mode

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 will send out four MIDI events each time

the crosshair is moved. These will be the same MIDI event (a controller, for example),

sent on four consecutive MIDI channels, starting with the channel set in the Vert

definition.

The values of these MIDI events corresponds to the proximity of the crosshair to the

vector fader’s four corners—upper-left for the lowest channel then upper-right, lower-

left and lower-right respectively for the ensuing three channels. In the center, all

channels receive a value of 32. At the corners, the corresponding channel receives a

value of 127 and all remaining channels receive a value of 0. This is with the default

range of 0 to 127. If you alter the range, the center and corners will behave differently

but mysteriously, the four values will always add up to 125.

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Apple Logic Pro 7 User Manual Page 253

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