/ Examples / Effects / WPDiodeLadder

WPDiodeLadder

The WPDiodeLadder is a resonanant filter that can "tune-in" to a target frequency with a narrow resonance band. This chugin was based on an online app-note found here The history is interesting but the technical details are not for the faint of heart.

Resonance controls the strength of the resonant effect. Values near 17 can produce significant overunity gain. Choose small Gain values if you want to preserve your auditory equipment.

Cutoff controls the filter cutoff frequency (in Hz). This value is typically swept to obtain a wah-wah effect. If you select high cutoff values its possible that the overgain effect will be more serious.

Saturation is a scalar multiplier that can be used to control or emphasize the nonlinearity in the filter. Only meaningful if Nonlinear is not None.

Nonlinear specifies how to implement the nonlinear aspect of the filter. None means no nonlinearities, Nonlinear means and Nonlinear Normalized offer varations on the theme.

Gain is a multiplier for filter output.

Bypass allows you to bypass the effect.

The Example

Here the node Cutoff, a CCGenerator, generates a dentist-drill-like sweeping of the Cutoff parameter. CNoise produces a white-noise signal which, when passed through WPDiodeLadder with a high resonance produces this annoying whistle sound. You can mute the effects of the filter by checking the Bypass parameter.