Dynamic transfer-function filter: map input level to cutoff with a Bezier curve, then let the filter move with your dynamics
VenusDynamicFilter is an innovative dynamic filter effect plugin that automatically adjusts the filter's cutoff frequency based on the input audio's loudness (level). Through a visual Bezier curve editor, users can customize the mapping relationship between level and frequency to achieve rich dynamic filtering effects.
Beyond classic Auto-Wah, dynamic brightness control, and rhythmic gating, you can use Trigger Delay (0–10s) to let the transient speak first and bring the filter movement in later. You can also enable Sidechain to drive the envelope from an external signal—perfect for “kick makes the pad breathe” style dynamic filtering.
Watch the plugin demo:
Filter cutoff frequency follows input level in real-time
Intuitive Bezier curve editor defines transfer function
6 types: LP / HP / BP + LowShelf / HighShelf / Peak
0–10s: delay the envelope response for “late filter entry”
Drive the envelope from external audio
A moving dot shows current level → cutoff mapping
| Parameter | Range | Default | Description |
|---|---|---|---|
| Mode | Peak / RMS | Peak | Level detection mode. Peak responds faster, RMS is smoother |
| Sidechain | On / Off | Off | When enabled, the envelope follows the external sidechain input |
| Attack | 0.1 - 2000 ms | 10 ms | Envelope follower rise time |
| Release | 1.0 - 5000 ms | 300 ms | Envelope follower fall time |
| Parameter | Range | Default | Description |
|---|---|---|---|
| Input Min | -120 - 0 dB | -60 dB | Minimum input level for mapping curve |
| Input Max | -120 - 0 dB | 0 dB | Maximum input level for mapping curve |
| Parameter | Range | Default | Description |
|---|---|---|---|
| Filter Type | 6 types | LowPass | LowPass / HighPass / BandPass / LowShelf / HighShelf / Peak |
| Gain | -24 - +24 dB | 0 dB | Only for Shelf/Peak types (disabled for Pass types) |
| Resonance / Q | 0 - 100% / 0.50 - 10.00 | 0% / 0.707 | Pass types show Resonance; Shelf/Peak show Q (higher Q = narrower band) |
| Min Freq | 20 - 2000 Hz | 20 Hz | Minimum cutoff frequency for curve output |
| Max Freq | 500 - 20000 Hz | 20000 Hz | Maximum cutoff frequency for curve output |
Min/Max frequency are auto-swapped internally to ensure Min < Max.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Trig Delay | 0 - 10 s | 0 s | Delays the envelope response (0.001s precision) |
| Dry/Wet | 0 - 100% | 100% | Dry/wet mix ratio |
| Output | -24 - +24 dB | 0 dB | Output gain compensation |
Use it when you want the transient to stay clean and bring the filter movement in later (e.g. 50–200ms), or push it further (1–3s) for slow, dreamy timbral evolution.
The curve editor is the core feature of VenusDynamicFilter, defining the mapping relationship between input level and filter cutoff frequency.
The moving dot shows the current envelope level (X) and the resulting cutoff frequency (Y) in real-time.
| Axis | Direction | Range | Description |
|---|---|---|---|
| X Axis | Left → Right | 0 dB → -60 dB | Input level (high level on left, low level on right) |
| Y Axis | Bottom → Top | 20 Hz → 20 kHz | Filter cutoff frequency (logarithmic scale) |
The plugin provides 5 built-in curve presets:
Settings: Filter Type: LowPass, diagonal curve from bottom-left to top-right, Attack: 5-20 ms, Release: 50-150 ms
Effect: The harder you play, the more the filter opens, simulating classic envelope filter effects.
Settings: Filter Type: LowPass, inverted curve (top-left to bottom-right), Attack: 50-100 ms, Release: 200-500 ms
Effect: Stays bright at lower volumes, darkens as volume increases. For controlling material with high dynamic range.
Settings: Filter Type: HighPass, steep step curve, Attack: 1-5 ms, Release: 100-300 ms
Effect: Opens high frequencies on hits, creating rhythmic filter effects.
Settings: LowPass, S-curve, Attack: 200–500 ms, Release: 1000–2000 ms
Effect: Slow movement following overall dynamics for flowing timbre changes.
Settings: LowPass, diagonal curve, Attack: 5–20 ms, Release: 100–300 ms, Trig Delay: 0.05–0.2 s
Effect: Transient first, motion later—great for creative SFX and articulation.
Settings: Main: pad/sustains; Sidechain: drums; Sidechain: On; LowPass; diagonal curve; Attack: 1–10 ms; Release: 100–300 ms
Effect: The pad “breathes” with the drum hits.
Settings: LowPass, S-curve, Attack: 500–1000 ms, Release: 1000–2000 ms, Trig Delay: 1–3 s
Effect: Deeply lagged movement for slow, dreamy evolution.
| Format | VST3 (Standalone planned) |
| Sample Rate | Any (auto-adaptive) |
| Channels | Mono / Stereo |
| Sidechain Input | Optional, mono/stereo |
| LUT Resolution | 1024 points |
| Curve Sampling | 256 points per segment |
| GUI Refresh Rate | 30 Hz |
| Trigger Delay | 0 - 10 s (0.001 s precision) |
| Min Freq Range | 20 Hz - 2000 Hz |
| Max Freq Range | 500 Hz - 20 kHz |
| Q Range | 0.50 - 10.00 (Shelf/Peak) |
| Parameter Smoothing | 5 ms |
| Window Size | 900 × 750 px |
| Download Build | Windows 10+ (x64) |
VenusDynamicFilter.vst3 folder to your VST3 plugin directory:
C:\Program Files\Common Files\VST3\