Apple Logic Express 7 - Manual (Page 53)

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Modulation
This chapter introduces Logic’s modulation effects.
This includes the Modulation Delay, Chorus, Flanger, Phaser, Tremolo, and Spreader
plug-ins.
Modulation Delay
As its name implies, the Modulation Delay generates effects such as flanging or chorus,
based on modulated short delays. It can also be used—without modulation—to create
resonator or doubling effects.
The modulation section consists of two LFOs, with variable frequencies (0 to 20 Hz). The
balance between these two is determined by the LFO Mix slider. Use the Width slider to
enter the desired modulation width. When the Width slider is set to the far right
position, delay modulation is switched off completely. The Vol.Mod. (Volume
Modulation) slider determines the intensity of amplitude modulation (Tremolo). The
Constant Mod. (Constant Modulation) button lets you do just that—ensure that the
modulation width remains constant, regardless of the modulation rate. When this
feature is switched off, higher modulation frequencies reduce the modulation width. In
simple delay circuits, a delay modulation would normally also modulate the pitch of
the signal. Use the Anti Pitch button to ensure that the pitch of the modulated signal
remains constant. This is exactly how high-end chorus and flanger effects work.