Fat Filter
Key Features
- Analog-modeled filter algorithm that eliminates digital artifacts and zipper noise during automation
- Switchable highpass and lowpass filter modes for buildups, breakdowns, and frequency cleanup
- Ultra-low CPU footprint under 1%, allowing dozens of instances per session
- Resonance control that adds musical emphasis at the cutoff point, with a pronounced low-end bump in highpass mode
- Smooth parameter response designed specifically for real-time filter sweep automation
- Supports sample rates from 44.1 kHz up to 192 kHz in both mono and stereo configurations
- Available in VST, VST3, AU, and AAX formats for broad DAW compatibility
Description
Fat Filter by SoundSpot is a streamlined resonant filter plugin built around an analog-modeled algorithm. It delivers artifact-free highpass and lowpass filtering with just two controls and a mode switch, making it an ideal tool for quick transitions and frequency cleanup.
The plugin was designed specifically to solve the CPU overhead and digital crackling that often come with using full-featured EQs for simple filter sweeps. Its lightweight engine uses less than 1% CPU, so you can run dozens of instances across a session without performance concerns.
Operation is deliberately minimal: a cutoff knob sweeps the filter frequency, a resonance knob adds emphasis at the cutoff point, and a toggle switches between highpass and lowpass modes. The analog-modeled algorithm produces smooth, zipper-free automation even under rapid parameter changes.
In highpass mode, cranking the resonance introduces a noticeable low-end bump that can add weight to kick drums and bass elements during transitions. The lowpass mode handles classic frequency rolloffs for buildups and breakdowns with the same smooth character.
Fat Filter runs as a 32-bit and 64-bit plugin in VST, VST3, AU, and AAX formats on both Windows and macOS. The installer weighs just 1.33 MB, keeping your plugin folder lean.
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Frequently Asked Questions
Does Fat Filter self-oscillate at high resonance settings?
No, Fat Filter does not self-oscillate. At higher resonance settings it adds a pronounced peak at the cutoff frequency, which works well for accentuating sweeps, but it will not produce the screaming feedback that some analog filter emulations offer.
Can Fat Filter handle fast automation without clicking or zipper noise?
Yes, this is one of the plugin's primary design goals. The analog-modeled algorithm was specifically engineered for smooth parameter changes, and testing confirms it produces no zipper noise even under extreme automation moves.
What is the difference between Fat Filter and SoundSpot's Fat 2?
Fat 2 is SoundSpot's paid successor that expands on the original with additional filter modes, drive controls, and modulation options. Fat Filter focuses purely on simple highpass and lowpass filtering with cutoff and resonance.
Is Fat Filter suitable for surgical frequency cuts or detailed EQ work?
No, Fat Filter is designed for broad filter sweeps and transitions, not precision mixing. If you need adjustable slope, filter drive, or multiple filter bands, a dedicated parametric EQ or more advanced filter plugin would be more appropriate.
