Apple Soundtrack Pro 2 - Manual (Page 337)

Chapter 11 Working with Audio Effects 337
Flangers
Flangers work in much the same way as do phase shifters, but additionally change
the pitch of the delayed signal slightly. Flanging is typically used to create a more
extreme change than phase shifting, sometimes described as adding a “spacey” or
“underwater” effect.
All of the modulation effects include parameters for the delay rate (also called speed or
frequency), which let you set the minimum delay time; depth (also called width or
intensity), which you use to set how much the LFO modulates the delay time; and mix,
which you use to control the ratio of the effected (wet) signal to the original (dry)
signal. They can also include parameters for feedback (or regeneration), which add part
of the output back into the input signal.
Reverb and Delay Effects
Reverbs and delays work by copying a part of the audio signal, delaying it for a brief
period of time, and then playing it back with the original signal. The delayed signal can
be played back multiple times, and can be modified in a variety of ways.
Delay
A delay effect stores the audio signal, and then plays back each repetition at a regular
rate of time after the original signal. Delays can be used for doubling individual sounds
(for example, making it sound as if a group of instruments is playing the same melody),
to achieve echo effects (making it sound as though the sound was occurring in an
immense space), and to enhance the stereo position of tracks in a mix. Delay effects are
not commonly used on an overall mix except to achieve special effects (such as to
create an “otherworldly” sound).
Delay effects let you set the delay time, the time between the original signal and the
delayed signal. Delays often provide parameters for feedback (also called regeneration),
which let you set how much of the delayed signal is fed back into the delay’s input,
creating more repetitions of the delay (like the number of “bounces” in an echo). Specific
types of delay have other parameters: Tap tempo delays let you set the delay time by
physically tapping a key or controller; stereo delays include parameters for the pan
position of the output signal, which can be shifted over time using a low-frequency
oscillator (called an LFO).