Blue Cat AcouFiendBlue Cat's AcouFiend is an acoustic feedback simulator plug in that can make your guitars scream, growl, or sing, even at low volume or through headphones, and it gives you total control over it! AcouFiend simulates the acoustic feedback (a. k. a "Larsen effect") well known to guitarists playing loud and close to their speaker Except that here, you have total control over the effect. You can choose when and how to trigger the feedback, on sustained