FLTRS

The Ultimate Synth Filter Ecosystem

37 legendary analog circuits and experimental physics engines. Turn your DAW into a living, breathing synthesis engine.

THE SOUL OF YOUR SOUND

The warmth of a Minimoog, the organic pluck of a Buchla, and the aggressive bite of an MS-20 do not come from the oscillator. The filter is the actual soul of the instrument.

FLTRS puts 37 of these legendary circuits directly under your hands. Whether you are processing a sterile soft synth, a drum bus, or a live vocal, FLTRS acts as a creative engine that shapes and breathes with whatever you feed it. With a built-in envelope follower and AniMod, and XYZ controls, you aren’t just automating an effect — you are performing an instrument.

ONE INSTANCE. FULL CONTROL. THEN STACK.

Every single algorithm in FLTRS is a full-featured filter instrument on its own — deep controls under the hood, but distilled into three main XYZ macro axes so you can shape the sound immediately without getting lost in parameters. One instance on one track already transforms your audio.

But FLTRS was also designed to be stacked. Because our custom DSP is incredibly CPU-efficient, you can run multiple instances in series, weaving them between your favorite delays and reverbs — turning your DAW into a massive, modular synthesis engine.

Take a basic drum loop, run it through the warm drive of a Moog ladder, add a 3rd-party reverb, feed it into the gritty bite of a Soviet Polyvox, and finally lock the harmonics in a shimmering Spectral Freeze.

INTRODUCING ANIMA CIRCUITS™

Most filter plugins fake it. They rely on static digital approximations that sound fine in the sweet spot, but shatter into harsh clipping and lifeless aliasing the moment you push them.
MNTRA rebuilt the physics. FLTRS is the debut of MNTRA’s Anima Circuits technology. We modeled the actual physical properties of every resistor, capacitor, and transistor. When you sweep a Anima Circuits filter, the virtual components interact exactly like physical metal and voltage. Crank the resonance into self-oscillation. Drive the input to the absolute limit. It warms up, screams, and sings without a hint of digital harshness. Anima Circuits is also the engine behind our MNTRA originals. Doppler Chaos, Gravity Filter, and Particulae are filters with no physical ancestors — impossible physics engines that could only be built using this technology.

AN ENTIRE STUDIO OF HARDWARE

To build this collection in the physical world, you would need racks of vintage synthesizers, rare West Coast vactrols, and boutique Eurorack modules.

FLTRS puts that entire studio into a single plugin. You get 12 hardware-accurate analog circuits, 8 experimental physics engines, and 5 spectral processors. Get thousands of dollars of vintage hardware and impossible acoustic geometry, all in one place.

37 ALGORITHMS. ZERO FILLER. 

Legendary Circuits: Rebuilt and Upgraded.

MNTRA didn’t just emulate the greatest filters in synthesizer history — they broke their physical limits. They gave the Juno-106 (QUASAR-106) an adjustable stereo BBD chorus. They gave the Jupiter-6 (EUROPA-6) negative resonance. They made the MS-20 (Filter 35) sweep continuously between lowpass, notch, and highpass. Authentic analog soul, upgraded with features the hardware never had.

The Featured Four

• Acid Ladder — The squelchy, rubbery diode ladder that defined the TB-303 and launched the acid genre.
• West Coast LPG — An organic, touch-responsive Buchla-style lowpass gate featuring. four distinct vactrol types.
• Spectral Freeze — A frequency-domain tool that grabs a moment of your audio and locks it into frozen, shimmering harmonic peaks.
• Gravity Filter — A MNTRA original physics engine that opens sharply on transients and falls back based on simulated gravity.

THE COMPLETE COLLECTION

Legendary Analog Circuits — 12 algorithms

Access 12 component-level models. Experience the vintage bite of the Korg MS-20, the snarling sweeps of the Roland Jupiter-6, and all three distinct circuit revisions of the ARP Odyssey on a single, morphable knob.

Algorithm Heritage Sonic Character

• Acid Ladder TB-303 diode ladder Squelchy acid with snappy envelope sweeps and rubbery self-oscillation.
• QUASAR-106 Roland Juno-106 Warm sweeps with lush BBD chorus and adjustable vintage aging.
• EUROPA-6 Roland Jupiter-6 Snarling resonance with bold sweeps, stereo detune, and parallel band-split.
• MERCURY IR3109-style 4-pole Modern OTA snarl with diode-softened feedback and transient accenting.
• Filter 35 Korg MS-20 Fast, gritty resonance with continuous morphing between LP, Notch, and HP.
• Odysseus ARP Odyssey Three distinct circuit revisions that gate dynamically with your signal.
• Xtreme Odysseus ARP Odyssey (Modded) Hotter nonlinear response with screaming peaks and chaotic collapsing saturation.
• SEMblance Oberheim SEM Creamy state-variable sweeps with lively resonance and driven analog breakup.
• Putney EMS VCS3 Asymmetric drive and wild, unstable resonance that sounds untamed.
• Polyvox Polivoks VCF Fizzy bandpass bite with stepped resonance for authentic Soviet character.
• Synthaflex ARP 2600 Steiner-Parker Aggressive sweeps with screaming injection-point diode grit.
• Vintage Filter Morph Five Classics Morphs continuously across five distinct vintage topologies in real-time.

West Coast and Formant — 4 algorithms

Touch-sensitive Buchla-inspired circuits alongside vocal resynthesis tools. Transform basic signals into plucky, breathing, and talking textures.

Algorithm Sonic Character

• West Coast Dual Vactrol LPG Buchla-style lowpass gate with four plucky, touch-responsive vactrol types.
• West Coast Spectral Warper Buchla-flavored spectral warping combined with woody saturation and gated noise.
• Vocal Morph Four-band vowel formants that make any audio signal talk or chatter.
• Soft Distortion Filter A warm state-variable filter featuring built-in soft clipping during sweeps.

Experimental Physics Engines — 8 algorithms

Explore 8 physics-based filters that have no hardware ancestor. Bend sound through space with Doppler Chaos, push audio apart with the Magnetic Filter, or shatter your signal into crystalline chords with Particulae.

Algorithm Sonic Character

• Doppler Chaos Physically modeled pitch drift that bends your sound through space.
• Gravity Filter Opens sharply on transients and falls back based on simulated physical gravity.
• Magnetic Filter Dual resonant poles that attract or repel based on your dynamic input.
• Tanh Chaos Warm nonlinear chaos that can spiral into controlled feedback runaway.
• Feedback Mesh A nonlinear grid delivering squelchy sweeps and aggressive formant peaks.
• Gnarly A dual highpass-into-lowpass topology ranging from tight sweeps to fuzzy chaos.
• Cry Wolf A high-resonance wah effect with sharp, aggressive vocal sweeps that howl.

Spectral Processors — 5 algorithms

Manipulate the frequency domain with 5 tools that go far beyond traditional filtering. Stretch, squeeze, and mangle your harmonics.

Algorithm Sonic Character

• Spectral Freeze Captures a moment of your signal and locks it into frozen, shimmering harmonic peaks.
• Spectral Glides Harmonic filter glides that lock into chord-like resonances.
• Spectral Warper Chaotic resonant sweeps that widen unpredictably the harder you push.
• Spectral Compression Squeezes or stretches your harmonic content for extreme sound shaping.
• M/S Spectral Warper Spectral warping with independent mid and side control.

Building Blocks, M/S, and Tone — 10 algorithms

Shape your sound with essential topologies like the Sallen Key and Transistor Filter. Gain dimensional control with independent Mid/Side processing variants and a dedicated 3-band EQ for fast tone shaping.

Algorithm Sonic Character

• Transistor Filter A Moog-inspired lowpass featuring three switchable, distinct circuit models.
• Sallen Key The textbook analog topology for clean, punchy, and fast filtering.
• Diode Morph A diode ladder that continuously morphs from warm lowpass to buzzy highpass.
• Yellow Jacket EDP Wasp-style CMOS grit — buzzy, compressed, and lo-fi.
• M/S Lowpass Lowpass with independent mid/side processing.
• M/S Highpass Highpass with mid/side balance control.
• M/S Bandpass Bandpass with mid/side isolation.
• M/S Ladder Moog ladder tone with full mid/side dimensional control.
• EQ 3 Band Broad musical curves with a thin-band mode for rapid tone shaping.

YOU DON’T AUTOMATE IT. YOU PLAY IT.
Standard filter plugins force you to draw rigid automation lines in your DAW. They are clinical, static, and predictable.

Every algorithm in FLTRS is alive. The built-in envelope follower constantly listens to your audio — hit a chord harder, and the filter opens wider; back off, and it breathes with your dynamics.

MNTRA also replaced menu-diving with MNTRA’s signature AniMod XYZ macro surface. Map cutoff, resonance, and drive to a single animated control. Sweep the macro pad and watch multiple parameters interact simultaneously. Built for tactile sound design and live performance.

Mastering-Grade Output Stage
When you push Anima Circuits into extreme self-oscillation, things get loud. MNTRA built a mastering-grade output stage directly into FLTRS so you can drive the filters as hard as you want without clipping your DAW. Catch wild resonant peaks with the dual-mode Limiter — switch from transparent modern control to aggressive, 1176-inspired vintage glue.

HEAR HOW THE PROS PLAY IT

• The Electronic Producer: Acid Ladder + Tanh Chaos on a bassline.
• The Sound Designer: Spectral Freeze + Gravity Filter for sci-fi textures.
• The Mix Engineer: SEMblance + Vintage Limiter to warm up a vocal.

THE MNTRA FX ECOSYSTEM

Already own BOREALIS or BRUITAGE? FLTRS shares the same AniMod XYZ reactive engine. Chain all three together and your entire signal chain — filter, distortion, reverb — breathes, moves, and reacts to your performance simultaneously.

300 ATELIER PRESETS
Designed by MNTRA’s award-winning sound and interactive team, FLTRS includes 300 Atelier presets that map out every possible sonic iteration — from subtle analog coloring to physics-breaking chaos.

Want instant results without tweaking? You don’t even have to sweep the filter. Just drop the SEMblance (MNTRA's Oberheim SEM model) or EUROPA-6 (MNTRA's Jupiter-6 circuit) onto a sterile track, leave the cutoff open, and let the Anima Circuits technology instantly impart expensive analog warmth and transformer weight just by passing your audio through it.