Apple Soundtrack Pro - Manual (Page 201)

Chapter 9 Working With Audio Effects 201
Graphic EQs
Graphic EQs give you a set of filters (often with 10 or 31 filters), each with a set center
frequency and bandwidth. Using a graphic EQ, you can shape a wide variety of
frequencies throughout the frequency range. Graphic EQs can be used to shape the
sound of the overall project mix.
Parametric EQs
Parametric EQs are similar to bandpass EQs, but provide a greater amount of control,
and can be used for extremely precise adjustments. With a parametric EQ, you can set
the center frequency, the gain, and the bandwidth. Used carefully, a parametric EQ can
help a track cut through the mix, or help a track or project sound fuller. Parametric EQs
can also be used to remove specific, unwanted frequencies from a mix.
Modulation Effects
Modulation effects begin with a delayed signal, like time-based effects, but vary (or
modulate) the delay time, typically using an LFO. This can be used to double a sound,
making it seem stronger and “fatter,” to simulate a group of voices or instruments
playing together, or to add a distinctive character to the sound. Modulation effects
include chorus, phase shifters, and flangers.
Chorus
Chorus effects play back multiple repetitions of the delayed signal (like reverbs), but
vary the delay time for each one, using an LFO. As the name implies, this effect can
strengthen the sound, and create the impression that the sound is being played by
many instruments or voices in unison. The slight variations in delay time created by the
LFO simulate the subtle differences in timing and pitch heard when several people play
together. Using chorus also adds fullness or richness to the signal, and can add
movement to low or sustained sounds.