AcouFiend.
Trigger screaming, singing feedback harmonics on demand, even in headphones.

Overview
Controlled feedback, even through headphones.
AcouFiend simulates the acoustic feedback, or Larsen effect, that guitarists get when playing loud near a speaker. It gives total control over when and how the feedback triggers, on sustained notes or chords, with harmonic selection and transposition. Because it generates the effect internally it works at low volume, through headphones, and even on synths or vocals.
Highlights
Compatibility
Specs and requirements.
Licence and delivery
- Formats
- VSTVST3AUAAX64-bit
- Licence
- Perpetual licence
- Delivery
- Instant download
- Type
- Amp Simulator
- SKU
- 1246-1241
- Product code
- 11-31399
macOS
- OS
- Mac OS 10.9 or newer (Intel or Apple Silicon)
- Processor
- Apple Silicon & Intel
Windows
- OS
- Windows Vista, 7, 8, 10 or 11 (SSE2 processor)
- Processor
- 64-bit Intel / AMD
Apple Silicon and Intel Macs are both natively supported.

About the maker
Meet Blue Cat Audio.
Blue Cat Audio is a software company based in Paris, France, founded by musician and engineer Guillaume Jeulin. It develops real-time audio effects, analysis tools, and plugin hosts, known for deeply customisable interfaces and flexible workflows.
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