Jon Johnson 208 Report post Posted June 15, 2017 The Frostwave Funk A Duck is an incredibly versatile and dynamic resonant envelope filter. The envelope is volume controlled so when the signal you put through such reaches a certain volume the envelope will flip open and send the signal via the filter. You can switch between high pass and low pass cutting off the filter abruptly when the volume lowers. This creates an excellent resonant analog "auto wah" effect which sounds as amazing on electronic drum loops, as it does on guitars, basses and keyboards. View full synthesizer Share this post Link to post Share on other sites