FLTRS is an effects filter plugin from MNTRA Instruments that works as a filter instrument on any audio track, built around 37 filter circuits.
FLTRS at a glance
| Developer | MNTRA Instruments |
|---|---|
| Type | Effects / Filter |
| Formats | VST3, AU, AAX |
| Operating systems | Windows, macOS |
| Architecture | 64-bit |
| Price on Plugin Boutique (October 2026) | €6.55 (regular €78.34) |
What FLTRS does
The plugin is organized as a collection of 37 filter algorithms, each with its own deep controls, so a single instance can reshape a track on its own. The developer describes it as a filter instrument rather than an automation-driven effect, and the notes state that one instance already transforms audio. Because the custom DSP is described as CPU-efficient, several instances can run in series and be woven between one another in a chain. The developer gives an example of a basic drum loop passed through a warm drive, then a Moog-style ladder filter, with a third-party plugin added after it.
Several engines are described as experimental physics engines with no physical ancestors. The Anima Circuits technology models the physical properties of each resistor, capacitor and transistor, so the virtual components interact as physical parts do, and resonance can be pushed into self-oscillation with input drive held at an absolute limit. The developer also lists Doppler Chaos, Gravity Filter and Particulae as filters in this group.
Key features
- Anima Circuits engine. The Anima Circuits technology models the physical properties of each resistor, capacitor and transistor, so the virtual components interact as physical metal parts do when the filter is swept.
- Physics-based filters. Doppler Chaos, Gravity Filter and Particulae are filters with no physical ancestors, built on impossible physics engines rather than analog circuit models.
- Envelope follower and XYZ controls. A built-in envelope follower called AniMod and XYZ controls let the filter respond to the incoming audio and be shaped by hand while the track plays.
- Chained instances. Because the DSP is described as CPU-efficient, several instances can be run in series and combined with other plugins to build longer processing chains.
Use cases
- Filtering a drum loop. The developer describes running a drum loop through a warm drive stage and a Moog ladder-style filter, then adding a third-party plugin after it.
- Processing vocals and buses. The notes describe the plugin being used on a live vocal or a drum bus, where the filter acts as a performing instrument rather than a static effect.
Who it is for
Producers and sound designers who want a filter that behaves as a performing instrument, and mix engineers who want to run several filter circuits in series on a track.
Price and availability
FLTRS was listed on Plugin Boutique in October 2026 at €6.55, reduced from €78.34. Prices change often, so the store page shows the current one.
FLTRS FAQ
Which formats does FLTRS support?
FLTRS is available as VST3, AU and AAX on Windows and macOS, with the AU crack and AAX crack builds named in release listings.