FILTRONIX: Circuit-Modeled Filter by Push and Groove (No Talking)

Описание: 4 Iconic Fiter Models in 1 Plufgin

https://codecreek8.gumroad.com/l/filt...

FILTRONIX v1.1.0

Now available for Windows, macOS

New in this version:
macOS support

Analog knob for warmer, thicker, more organic filter tone

Refined existing filter models for smoother and more natural behavior

1. FILTRONIX: Circuit-Modeled Filter

FILTRONIX is a "ZDF Circuit-Modeled Filter" that reconstructs legendary analog synthesizer filter circuits within the digital realm.

It is currently available as a free VST plugin, so I would be thrilled if you could give it a try. At the moment, it is Windows-only, but if the response is positive, I plan to develop a Mac version as well.

Currently, it only features a low-pass filter, but multi-mode support is planned for future updates. Additionally, due to the heavy processing required for circuit modeling, I will be working on further CPU optimization.

Circuit Modeling

We mathematically describe the circuit behavior (Circuit Modeling). The physical behavior of individual components such as capacitors, resistors, and transistors has been formulated into complex differential equations. By calculating these tens of thousands of times per second, we have recreated in the digital domain the unique nonlinear character, distortion, and "self-oscillation" that occur near physical limits when electricity flows through real hardware circuits.

ZDF (Zero-Delay Feedback) Algorithm

In typical digital filters, a "one-sample delay" occurs in the calculation of the feedback loop, making it difficult to reproduce the smoothness and extreme oscillation unique to analog gear. FILTRONIX adopts Zero-Delay Feedback (ZDF) technology to resolve this mathematical contradiction. This achieves an unbreakable, analog-like cohesiveness even when modulating the cutoff and resonance at high speeds.

4x Oversampling & Clean Filtering

FILTRONIX runs its internal processing at 4x oversampling to reduce aliasing and preserve a cleaner sound. A 33-tap FIR polyphase filter is used for high-quality downsampling with accurate phase response.

Analog-Style Saturation

FILTRONIX uses ADAA-based tanh saturation to recreate the dynamic non-linearity of analog circuits. Combined with a high-resolution Fast Math LUT, it delivers rich saturation and circuit-like character while keeping CPU usage efficient.

3. Four Filter Models



FILTRONIX models four historical circuits, each with a distinct character:

M-Filter (Transistor Ladder):

Models the ladder filter of a legendary American monophonic synthesizer. It features a sharp, pronounced resonant peak and the classic, musical low-end roll-off as resonance is increased.

S-Filter (Classic SVF):

Based on the State Variable Filter (SVF) from an iconic '70s synthesizer module. It retains a thick low-end even at high resonance settings, delivering razor-sharp tones right on the edge of self-oscillation.

P-Filter (Polyphonic OTA):

Recreates the OTA cascade filter of the legendary 5-voice polyphonic synthesizer that defined the '80s music scene. It delivers a consistently fat and punchy sound.

W-Filter (British CMOS):

Models the unique CMOS circuit of a cult-classic, yellow-and-black British synthesizer. It is characterized by the inherent instability of CMOS chips and a sudden, aggressive self-oscillation.



4. “Analog” Knob



The Analog knob is a new feature introduced in Ver 1.1.0. It adds analog-style movement, thickness, and edge by slightly loosening the “too-perfect” behavior of the digital filter circuit.

Turning up the Analog knob adds subtle cutoff drift, resonance movement, crosstalk, and input-sensitive saturation.

It gives FILTRONIX a more organic, hardware-like feel with added roundness, weight, and analog-style movement.






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