Filteronix
5 MB
Analog character without losing control.
FILTRONIX combines circuit-inspired filtering with modern DSP techniques for smooth resonance, controllable drive, and practical mix-ready operation.
Circuit modeling
Model the behavior
Filter topology, feedback, saturation, and resonance interact as one system instead of a stack of unrelated effects.
ZDF / TPT
Keep resonance responsive
Zero-delay feedback topology supports smooth cutoff movement and stable behavior at high resonance.
Nonlinear drive
Add tone with clarity
ADAA saturation and 4x oversampling help control aliasing while the Drive stage adds weight and edge.
Visual feedback
See the filter move
The spectrum and response display make cutoff, resonance, and tonal changes easy to follow.
Four circuits. Four personalities.
Switch filter character without rebuilding your processing chain.
M-Filter
Transistor ladder
A pronounced resonant peak with the familiar musical low-end movement of a classic ladder response.
S-Filter
Classic state variable
A thick, focused response that keeps weight around strong resonance and near self-oscillation.
P-Filter
Polyphonic OTA
A fat and punchy cascade character inspired by the sound of classic polyphonic instruments.
W-Filter
British CMOS
An unstable, aggressive response with sudden resonance and a distinctly raw circuit character.
Why ZDF / TPT matters.
The feedback loop is central to how an analog filter responds when cutoff and resonance are pushed.
Delayed feedback
A digital compromise
A unit delay inside the feedback path can change the response and make extreme resonance feel less connected.
Zero-delay feedback
A tighter circuit response
ZDF / TPT solves the feedback relationship within the current sample for smoother control and more analog-like interaction.
FILTRONIX combines ZDF / TPT filtering with nonlinear saturation, 4x oversampling, and a phase-compensated 33-tap FIR polyphase stage.
Analog movement, not static perfection.
The Analog control introduces subtle variation that makes the filter feel less mechanically identical from moment to moment.
Formats
Windows VST3 / macOS AU & VST3
Filtronix.1.2.0-1.2.1 ( 5 MB )
