FILTRONIX
Key Features
- Four circuit-inspired filter models cover transistor ladder, state-variable, OTA cascade, and CMOS-style responses.
- Zero-delay feedback processing is used to keep high-resonance sweeps smoother and more cohesive than basic digital filtering.
- 4x oversampling and a 33-tap FIR downsampling filter target cleaner saturation and reduced aliasing.
- ADAA tanh saturation adds nonlinear drive behavior as input level and resonance are pushed harder.
- Low-pass-only design keeps the workflow focused on analog-style sweeps, tone darkening, resonance, and self-oscillation.
- Windows VST3 delivery makes it a lightweight filter insert for DAWs that support modern VST plugin formats.
Description
FILTRONIX is a Windows VST3 filter effect from Push and Groove built around zero-delay feedback circuit modeling. It focuses on analog-style low-pass filtering, resonance, drive, and self-oscillation rather than clean utility EQ work.
The plugin models four historic filter families: a transistor ladder, a classic state-variable filter, a polyphonic OTA cascade, and a British CMOS-style circuit. Each model is meant to react differently around resonance, low-end behavior, punch, instability, and aggressive self-oscillation.
Its sound design comes from more than the filter selector. The Gumroad page documents circuit-model equations, 4x oversampling, a 33-tap FIR downsampling filter, ADAA tanh saturation, and a lookup-table approach for heavier saturation while keeping CPU use manageable.
As checked on May 13, 2026, the official Gumroad page lists the product price as 0 USD and says FILTRONIX is a free VST plugin for Windows. SoundShockAudio directs users to the current external download page.
Frequently Asked Questions
What kind of filter plugin is FILTRONIX?
FILTRONIX is a circuit-modeled low-pass filter effect. It is built for analog-style movement, resonant sweeps, saturation, and self-oscillation rather than transparent EQ correction.
Which filter models are included?
The official page lists four modeled circuits: M-Filter, S-Filter, P-Filter, and W-Filter. They are based on transistor ladder, state-variable, OTA cascade, and British CMOS-style filter behaviors.
Does FILTRONIX support macOS?
Not in the current release. The Gumroad page says FILTRONIX is currently Windows-only, with Mac versions planned if the response is positive.
Does it offer high-pass, band-pass, or multimode filtering?
The current Gumroad page says the plugin only features a low-pass filter. The developer notes that multimode support is planned for future updates.
