Push and Groove has released a “ZDF Circuit-Modeled Filter” that faithfully reconstructs the legendary analog synthesizer filter circuits in the digital domain. FILTRONIX aims to capture that authentic analog feel.
The plugin models 4 historic circuits, each with its own 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.
Currently available in VST/VST3 plugin formats for Windows, FILTRONIX is a “pay what you like” download (including free).
More information: FILTRONIX

