Upgrade Manual

Appendix A: "Audio Plugins"88
Distortion:
Add some grit before filtering. When Distortion is set to a value
of 1, there is no distortion.
The Auto-Wah distortion has a razzier sound than the Band-in-a-Box Soft
Distortion plugin. The Auto-Wah distortion takes a mathematical root of all
the sample values. This raises the amplitude of small sample values.
When set to 2, Distortion takes the square root of all values. A value of 3
takes the cube root of all values, and a value of 10 takes the tenth root of all
values (a very nasty sound indeed).
Lo Freq, Hi Freq:
The filter's lower and upper frequency cutoff limits.
Quiet audio input levels allow the filter to drop to the Lo Freq cutoff, and
very high input levels will pin the filter at the Hi Freq cutoff.
Wah effects usually sweep the filter in a range somewhere between 100 and
2000 Hz. The wah effect doesn't sound very "traditional" if the frequency
settings go too high or low.
If the Wah effect is too dark on quiet notes, try increasing Lo Freq. If the wah
effect is too bright on loud notes, try decreasing Hi Freq.
Lo Thresh, Hi Thresh:
The lower and upper thresholds that will modulate
the filter within its frequency range.
In the pictured example, input signals below –36 dB are filtered at 168 Hz.
Input signals above –12 dB are filtered at 1538 Hz. Levels between these
thresholds will sweep the filter between the Hi and Lo Frequency settings,
producing a Wah effect.
Resonance:
Resonance adds a loudness peak at the cutoff frequency. When
the filter sweeps around, this loudness peak emphasizes (resonates with)