Dynamic Transfer Function Filter - Dynamically controls filter cutoff frequency based on input level for rich dynamic filtering effects
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.
Whether it's classic Auto-Wah effects, dynamic brightness control, or creative rhythmic gating effects, VenusDynamicFilter can easily achieve them. The equipped Lookahead feature allows the filter to "anticipate" incoming transients for more precise dynamic control.
Watch the plugin's feature demonstration and tutorials:
Video demo coming soon
Filter cutoff frequency follows input level in real-time
Intuitive Bezier curve editor defines transfer function
Supports Lowpass, Highpass, and Bandpass filter types
Adjustable trigger delay for anticipating transients
| Parameter | Range | Default | Description |
|---|---|---|---|
| Mode | Peak / RMS | Peak | Level detection mode. Peak responds faster, RMS is smoother |
| 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 | LowPass / HighPass / BandPass | LowPass | Filter type |
| Resonance | 0 - 100% | 0% | Resonance intensity. 0% is Butterworth standard response (Qβ0.707, flat no resonance); at 100% produces strong peak at cutoff, classic "wah" effect during dynamic sweeping |
| Min Freq | 20 - 2000 Hz | 20 Hz | Minimum cutoff frequency for curve output |
| Max Freq | 1000 - 20000 Hz | 20000 Hz | Maximum cutoff frequency for curve output |
Based on JUCE StateVariableTPTFilter implementation, using Butterworth standard as baseline:
| Resonance | Internal Q Value | Sonic Effect |
|---|---|---|
| 0% (default) | β 0.707 | Butterworth flat response, no resonance, smooth filter transition |
| Medium | β | Slight gain boost near cutoff, more "colorful" sound |
| 100% | β 0.05 | Maximum resonance, produces sharp peak and "resonant" character |
In dynamic filtering scenarios, Resonance adds expressive "wah" effects during filter sweeps, similar to classic synthesizer filters or triggered wah pedals.
| Parameter | Range | Default | Description |
|---|---|---|---|
| Delay | 0 - 500 ms | 0 ms | Trigger delay (Lookahead). For precise control of filter response timing during offline processing, allowing DSP to "anticipate" transients |
| Dry/Wet | 0 - 100% | 100% | Dry/wet mix ratio |
| Output | -24 - +24 dB | 0 dB | Output gain compensation |
This parameter is designed for offline processing (render/export) scenarios. By delaying the audio signal, the envelope detector can "anticipate" incoming transients, allowing the filter to start responding before the transient arrives. This is particularly effective for processing drums and transient-rich material, achieving precise dynamic control that traditional real-time processing cannot.
Note: Using Delay introduces equivalent latency, recommended only for offline rendering. Set to 0 ms for real-time monitoring.
The curve editor is the core feature of VenusDynamicFilter, defining the mapping relationship between input level and filter cutoff frequency.
| Axis | Direction | Range | Description |
|---|---|---|---|
| X Axis | Left β Right | 0 dB β -60 dB | Input level (high level on left, low level on right) |
| Y Axis | Bottom β Top | 20 Hz β 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: Filter Type: LowPass, inverted curve, Attack: 0.1-1 ms, Release: 50-100 ms, Delay: 5-20 ms
Effect: Using Lookahead delay, the filter can start responding before the transient arrives. Ideal for drum processing.
| Format | VST3, Standalone |
| Sample Rate | Any (auto-adaptive) |
| Channels | Mono / Stereo |
| Latency | 0 - 500 ms (adjustable Lookahead) |
| LUT Resolution | 1024 points |
| Curve Sampling | 256 points per segment |
| GUI Refresh Rate | 30 Hz |
| Frequency Range | 20 Hz - 20 kHz (adjustable) |
| Frequency Smoothing | 5 ms (prevents zipper noise) |
| Window Size | 900 Γ 560 pixels |
| System Requirements | Windows 10+ / macOS 10.13+ |
VenusDynamicFilter.vst3 folder to your VST3 plugin directory:
C:\Program Files\Common Files\VST3\