Apple Logic Pro 9 - Manual (Page 1097)

Fader Objects
Faders are used to send MIDI events by clicking or dragging them. Faders come in different
forms (knobs, sliders, numerical, and buttons). Fader objects respond to incoming MIDI
events.
To create a new fader
µ
Choose New > Fader.
A submenu appears, in which you select the style of fader you want. There’s also a
submenu at the bottom named Special, used to select various special fader types (cable
switcher, meta-fader, and so on).
The style of a fader determines its onscreen appearance (slider, knob, menu, numerical),
and how it responds to the mouse (click and drag, double-click and type a number, click,
and choose from a menu).
Horizontal fader
Vertical fader Button Knob
The auto style fader—the default style if you create a fader with a key command—changes
styles as you alter its shape and size.
The type of fader determines what events the fader sends out and responds to. In two
cases, however, the fader doesn’t send out events at all:
• The cable switcher routes events to its different outputs. Clicking a cable switcher object
makes it step sequentially through the outputs.
• The alias assigner changes the references (to an original, or parent object) of fader
aliases.
In general, a fader’s style is completely independent of its type. A cable switcher can look
like a button, a knob can send out MIDI or meta or SysEx events, and so on. The one
exception is the vector style fader—these behave in a special way, by sending out two
(or four, in special cases) messages at a time, depending on the mouse location within
their 2-dimensional, vector window.
1097 Chapter 37 Environment Objects Reference