If it looks like a duck, acts like a duck, and QUACKS like a duck, then it must be a duck.  That's how we came up with the name for our new envelope filter. This feathery little guy is a joy to play because of its incredibly quick response to your right hand - much faster and more expressive than your typical auto-wah pedal.  The attack determines how quickly the filter responds to the envelope, and the decay sets how quickly the filter releases afterwards.  The range controls which frequency spectrum the filter does it's magic on.  Add to this relay based full-bypass switching with failsafe, and you've got one crazy little quacky beast.  It is so expressive that you'll want to give up on your rocker-wah forever.