27/06/2026
De-Feed DF-1 is a professional feedback suppressor plugin for live sound, streaming, and rehearsal setups.
When feedback starts to ring, DF-1 detects it fast and applies narrow notch filtering to reduce squeals before they take over your mix.
Built for
🟢 VST3, AU, AAX,
🟠 Waves Super Rack Live
🔴 Fourrier Audio TRANSFORM.ENGINE.
DF-1 helps you run monitors and PA systems with more confidence and more usable gain, while preserving the natural tone of vocals and instruments.
Why engineers use DF-1:
Real-time feedback detection tuned for live situations Up to 8 precise notch filters for targeted suppression Adjustable Threshold, Notch Depth, Speed, and Release Auto, Manual, and Adaptive workflows Output limiting for safer final levels
DF-1 is a real-time feedback suppression processor built around a detection stage + notch filter bank + safety output stage.
The signal path is: Input (stereo) -> mono analysis tap -> feedback detector -> notch filter bank -> output limiter -> Output (stereo)
➡️ Detection:
DF-1 analyzes incoming audio using a lightweight Goertzel-bin approach at selected candidate frequencies. For each analysis window, it compares narrowband bin energy against broadband window energy. A bin is considered a feedback candidate when its relative energy exceeds the user threshold and shows sustained rise across consecutive frames (to reject short transients).
➡️ Suppression:
When a feedback frequency is confirmed, DF-1 activates the nearest available notch slot. Each slot is a narrow biquad notch / EQ dip, allowing targeted attenuation with minimal collateral tonal loss. Up to 8 notch slots can be used in parallel, with user-adjustable notch depth.
➡️ Modes:
🟧 Auto: detector engages notches automatically.
🟩 Manual: user controls notch activation/frequencies directly.
🟦 Adaptive: notches can track slow frequency drift to follow moving feedback peaks.
Dynamics and safety Timing controls (Speed, Release) shape how quickly suppression engages and relaxes. A final output limiter helps keep peaks controlled after corrective filtering.
🔜 https://cynicos.com/df-1-live-processor/
