Logic Pro Guide - AU Effects
Audio Units Effects Plugins
AU Effects are OS X's native audio plugin format; they rely
on CoreAudio, and are free to anyone who is running OSX 10.2 or later. They
are available in every version of Logic beyond 5.5 as well as in other OSX-native
applications such as Final Cut Pro and GarageBand.
Bandpass
Filter
Allows only audio beyond the set bandwidth to "pass through"
and be heard.
Delay
Generates a copy of the audio which plays after the set time
(delay). The feedback control determines how long the repeated audio will
sound. The dry/wet mix determines how much of the repeated audio is heard
against the original signal.
Graphic
EQ
A graphic equalizer lets you enhance or diminish multiple frequencies
at a single place in the audio chain. This would be more helpful if all
the bands were numbered. Settings used by the Graphic EQ in other programs
(like iTunes) can be used from within Logic.
High
Shelf Filter
A high shelf filter sets an upper limit for which frequencies
can be heard. Signals above that limit are silent.
Hipass
Filter
A hipass filter sets an lower limit for which frequencies
can be heard. Signals below that limit are silent.
Lowpass
Filter
A lowpass filter sets an upper limit for which frequencies
can be heard. Signals above that limit are silent.
Low
Shelf Filter
A low shelf filter sets a lower limit for which frequencies
can be heard. Signals below that limit are silent.
Matrix
Reverb
Reverberation occurs when sound reflects against objects,
like walls and floors, or even canyons. As people are used to hearing sounds
in various different environments that have different sizes and different
ambience (in the car, in the bathroom, in a church), it's good to place
musical instruments in a spacial context. The Matrix Reverb is not a bad
sounding reverb for a freebie. There are lots of controls, making this quite
flexible.
Parametric
EQ
A parametric equalizer pinpoints a single frequency to enhance
or diminish.
Peak
Limiter
A limiter is a device which prevents audio from going beyond
a set volume level. Apple's AU peak limiter provides a fairly simple example
of this feature.
