Blue Cat Audio AcouFiend is an acoustic feedback simulator for guitar that recreates the screaming, singing, speaker-nearby feedback effect without requiring high volume in the room. Blue Cat positions it as a controllable version of the Larsen effect, giving players access to sustained feedback behavior even through headphones or low-level monitoring.Key features: Simulates acoustic guitar feedback in a controlled software environment Designed to create scream, growl, or singing sustain effects at low volume Useful for expressive lead guitar work without relying on loud amps in a room Gives users more control than natural uncontrolled feedback provides A practical tool for studio players, headphone users, and sound designers AcouFiend is a niche product in the best sense: it solves a very specific guitar problem creatively. It belongs on pages aimed at players who love feedback-driven expression but need consistency, recall, and low-volume practicality.