Apple Logic Express 7 - Manual (Page 47)

Chapter 6 Filter 47
Warning: Please take care while doing this, or your ears and speaker system may be
damaged.
Relative Q
The quality of the main filter peak can be increased/decreased, relative to the model
setting, thereby obtaining a sharper/softer wah sweep. When set to a value of 0, the
original setting of the model is active. Range:
−
1.00 to
+
1.00 (0.00 is the default)
Pedal Range
Common MIDI foot pedals have a much larger mechanical range than most classic Wah
pedals.
The exact sweep range of the wah filter effected by the MIDI foot pedal is set with the
Pedal Range parameters. The highest and lowest possible value reached by the pedal is
graphically represented by a gray bracket around the Pedal Position fader (see below).
The left and right limit is set by clicking and moving it with the mouse. Additionally
both values can be moved simultaneously by clicking in the center of the bracket and
moving it to the left or right.
Pedal Position
This parameter represents the current position of the Wah pedal.
To control and automate the Pedal Position via an external MIDI controller for example
a MIDI pedal, your Logic Environment has to be prepared accordingly.
AutoWah Depth
In addition to using MIDI foot pedals (see above), the wah effect can be controlled
using the Auto Wah facility. The sensitivity of the Auto Wah can be set with the Depth
parameter. Range: 0.00 to 100.