auto-wah LADSPA plugin


This LADSPA plugin is the combination of a 'wah' pedal and a simple envelope follower.

Controls are:
 - Freq: the resonance frequency of wah filter.
   This would normally be controlled using a
   midi pedal.
 - Mix: crossfades between dry and wet signal, the
   first is the original input signal and the latter
   is the pure output of the resonant filter amplified
   by 18 dB.

The three remaining parameters control the envelope follower. This produces a control signal that is added to the 'Freq' setting.
 - Drive: input gain to the envelope follower (so
   this gain is not in the signal path).
 - Decay: controls the decay time of the envelope.
 - Range: controls how much the envelope is allowed
   to modify the basic frequency.

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