DOD GFX 25 ENVELOPE FILTER "EXTREME" 

A rare variation of the FX 25b, which added a blend function,  the GFX-25 is derived from the classic DOD 440 Envelope Filter. The bandpass filter circuit determines peak frequency from the input signal level giving you a touch controlled auto-wah effect. Lots of low end via the huge resonant filter. Funky,  ut with a but of available growl!