Are you searching for smooth, silky, analog filter sweeps? Or are grimy, resonant squelches more your style? Nothing adds character to a track faster than a great filter, and FilterFreak can do it all. From funky envelope follower sounds reminiscent of the classic Mutron, to wide resonant LFO sweeps like the Sherman Filterbank. From timeless wah-wah tones to campy sci-fi sample-and-hold effects.

Whether you’re controlling it manually, or locking it to tempo for rhythmic effects, FilterFreak delivers the warm, fat, resonant tones you crave. And we’ve also added exclusive features you won’t find in the classics, so you can create practically any filter effect you can dream up.


Analog Sound

FilterFreak faithfully recreates the sounds of classic analog resonant filters. Twist the frequency knob for smooth retro synth sweeps. Crank up the resonance to add some edge, or even push the filter into self-oscillation. And when you drive it hard, FilterFreak responds by breaking up in a gritty and pleasing way, just like hardware.

We’ve included seven different analog saturation “styles” that range from warm or crunchy distortion to pumping compression. From subtle to extreme, FilterFreak packs a ton of analog magic into a convenient digital package.

Rhythm and Groove

While tweaking knobs is always fun, FilterFreak also includes rhythm and groove tools that add motion to your tracks automatically. Turn on Rhythm Mode and flip the MIDI switch to create auto-wah effects that sync to your DAW.

FilterFreak - Rhythm Editor

Choose a simple note value like eighths or sixteenths, select from a library of pre-made rhythms, or even design your own rhythmic patterns using the Rhythm Editor. Then, to perfectly match the feel of your tune, grab the Groove knob and add some swing or shuffle to drop it in the pocket. For effects that move with the music, choose the Envelope or ADSR modes to trigger the filter with incoming audio. You’ll be amazed by how much one plug-in can transform the feel of your tracks.


Double Your Pleasure

FilterFreak actually includes two separate plug-ins — FilterFreak 1 and 2. Load up FilterFreak 1 for a single, simple filter. But if you want more power, fire up FilterFreak 2. It gives you two analog filters side by side that can be used in series or parallel. Combining two filters with FilterFreak’s deep modulation options gives you a huge range of moving sounds to explore.


Capture the sound of classic resonant filters, with extended control and flexibility

Funk up guitar, fatten bass, reshape drums, sweep synths and freak out vocals

Choose from one filter, or two that can be used in series or parallel

Select highpass, lowpass, bandpass and band reject modes with 2 to 8 poles

Add synth-like resonant sweeps or classic wah-wah tones to your tracks

Create funky auto-wah, envelope follower and sample-and-hold effects

Grunge things up with 7 different analog saturation styles

Construct intricate rhythmic filter sequences with the Rhythm Editor

Design your own LFO shapes with the Shape Editor


“FilterFreak can do the most amazing things to make something simple sound interesting.” – Tom Elmhirst (Adele, Amy Winehouse, The Black Keys, Florence & The Machine)

“I used Filter Freak on about eight of the nine tracks on the record.” – Jay Gordon – Orgy

“FilterFreak is a winner. Simply put, it sounds great.” – EQ Magazine

“…truly jaw-dropping, goose-pimple-inducing levels of creative inspiration and excitement.” – Remix Magazine


Current version: 5.0.4

Plug-in formats (both 32 and 64-bit):

  • AAX Native, AAX AudioSuite, VST, and Audio Units (AU)

Supported sample rates:

  • Minimum: 44.1 kHz, Maximum: 192 kHz

System requirements:

  • Operating system: Mac OS X 10.8 or later, Windows 7 or later
  • An internet connection is required at the time of activation.

Supported host applications:

  • Pro Tools (10.3.5 or later), Live, Cubase, Nuendo, Sonar, Logic, Digital Performer
  • Click here to view our full list of compatible host applications.

Other requirements:

  • account (An iLok USB dongle is not required. Create a free account here)

Download Manual

Soundtoys, FilterFreak, FilterFreak1, FilterFreak2 and their respective logos are all trademarks of Soundtoys, Inc.

*All other trademarks are the property of their respective owners, which are in no way associated or affiliated with Soundtoys. These trademarks are used only for historical reference or to identify products whose sounds or tone were studied in the development of FilterFreak.

Included In

Soundtoys 5
Soundtoys 5

The Ultimate Effects Solution. All 18 Soundtoys plug-ins including the new Effect Rack, PrimalTap, and Little AlterBoy. No iLok dongle required. Learn More.


Soundtoys 5 Academic

More Products


Decades of echo devices in a single plug-in. The pro standard for vocal echo. Learn More.



Modeled retro dual delay with “freeze” for lo-fi pitch warped loops and delays. Learn More.



Subtle to extreme hardware-modelled saturation. The secret weapon of top mix engineers. Learn More.


Little AlterBoy

The classic studio trick for super wide vocals – with a powerful new twist. Learn More.



Rhythmic auto-panning with cool classic features, new tricks, and analog color. Learn More.


Devil-Loc Deluxe

Vintage vibe, drive, and the magic tone of the 1567a tube mixer. A beast on bass and drums. Learn More.



Analog guitar tremolo effects and beyond with beat-synced rhythmic chopping. Learn More.


Little MicroShift
Little PrimalTap
Little Radiator