Blue 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 notes or chords. The plug-in lets you select the main harmonic of the feedback, and you can even choose to transpose it for more creative effects.

Of course, it can be entirely automated or controlled via MIDI.

And since it is a plug-in, it is not just for guitars: create screaming synths, sustained vocal harmonies and more...

Blue Cat Audio Standards:

• Available in most plug-in formats for Mac and Windows.
• Full MIDI control and automation support, MIDI Learn.
• No CPU load on idle: processing shuts down when fed with silence (optimal CPU usage).
• Customizable user interface with transparency & zoom.
• Smooth Bypass: noiseless plug-in activation / deactivation.
• Undo/Redo.
• Full featured integrated presets manager.
• Copy/paste the state of the plug-in between instances.
• Any sample rate supported.

Version 1.1

• Single Installer on Mac (all plug-ins formats).
• Apple Silicon (M1 processor) support.
• Dropped 32-bit support on Mac.
• Now requires MacOS 10.9 and newer.
• Arrow keys can now be used to navigate presets.
• Added MIDI control support (MIDI CC messages) for Next and Previous Preset commands, with MIDI learn.
• Improved MIDI & automation control settings with lock, reset and "save as global setting" capabilities.
• Improved smooth plug-in bypass (faster and smoother transition).
• Unicode support.
• Windows: improved GUI loading performance.
• VST3: fixed random crash in Ableton Live 11 upon load.
• Mac Audio Unit: fixed plug-in listing in some host applications (Plogue Bidule).
• Mac: fixed GUI performance issues on native P3 displays and improved performance on other displays.
• Mac: fixed mouse wheel that required large movements to change parameter values.
• Mac: fixed mouse cursor flickering issues.
• Mac: fixed Esc key not closing fine edit parameter dialog.