Apple Logic Pro 7 User Manual download pdf (Page 228)

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228 Chapter 5 The Environment

You can remote-control any fader by using its In definition, allowing you to use faders

(as well as other transformers) to convert MIDI events to meta events—for remote-

control of transformers.

Condition: Map

Most transformer conditions are numerical relationships (=, unequal, inside, and so on),

and the condition is met if the incoming MIDI event value satisfies the condition. The

last condition, Map, works a little differently. Two numerical parameters are specified,

and the incoming value is first converted by the map, then the mapped value is

compared to the two parameters to see if it falls inside them.

Transforming Meta Events

Transformers can also process meta events, as long as they are not the meta events

that affect transformers. These particular meta events change the transformer, rather

than being processed by it.

Arpeggiator Object

The arpeggiator turns chords into arpeggios. It plays the currently held notes—

individually—in a selectable pattern (up, down, random, and so on), and at a selectable

speed that ranges between whole-notes and 768th-notes.

The arpeggiator features a number of useful parameters including; note-length, repeat

on/off and octave doubling. All of its parameters can be changed in real time through

the use of MIDI controller messages.

Important: Logic must be in play (or record) mode for the arpeggiator to work.

To create a new arpeggiator, select New > Arpeggiator.

The arpeggiator cycles through all held notes (arpeggiates chords) within its range. You

can set the range to be as wide or narrow as you wish. There are parameters for

direction, velocity, speed, note length, start quantize (snap), repeats, octaves, and

velocity offset. All of the arpeggiator’s parameters can be MIDI controlled in real time,

which adds immensely to its versatility.

To use the arpeggiator, you must place it in the MIDI signal path, and Logic’s Transport

must be running. (For technical reasons, the arpeggiator resets on cycle jumps).

Typically, you would assign the arpeggiator to an Arrange track, and cable its output to

an instrument or port Object. You can, of course, insert it anywhere else in the MIDI

signal path.

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