No other plugin has the comprehensive ability to manipulate pitch and time like Fault. Whether used at mixdown to fortify weak tracks or in sound design to totally mangle instruments beyond recognition, Fault's applications are limited only by your imagination. With over 100 factory presets included – featuring settings from contributing artists like Richard Devine and Scott Kirkland from The Crystal Method – finding creative inspiration with Fault is fun and engaging.

Three main processors power Fault's comprehensive spectral control. Dual-channel Pitch Shifters musically retune sounds up or down as much as a full octave, in steps as small as 0.1 semitone. The stereo Frequency Shifter can be modulated by precision FM controls to create beautiful and discordant sounds alike. Stereo Delays use cross-channel feedback and filters to add immersive depth. And if that weren't enough, every control knob and switch setting can be itself controlled dynamically by up to eight powerful and flexible modulators, two of which are brand new in version 1.1: Step Sequencer, and ROLI Lightpad (for seamless integration with ROLI’s latest MIDI controller hardware).

Medicine or Mutilation—You Choose!

Fault's schizophrenic personality can take your tracks in any direction you want: make boring tracks sound richer and more exciting, or take pristine tracks to the next level of frequency-modulated mayhem. Place the Frequency Shifters in ring modulation mode and sprinkle with short delays to make a dull, lifeless snare drum sizzle like a firecracker. Still too tame for your industrial heart? Filter and feed back Fault's Pitch Shifters and add a smidgen of split-second delays to make snare hits sound like sonar hunting for submarines! If you can imagine it, Fault will take you there.

Fault's freely assignable modulators create more realistic-sounding ADT (automatic double tracking) effects for vocals than most doublers. Modulate an LFO—patched to the stereo Pitch Shifters—with a second LFO to create tape recorder-style varispeed ADT effects like the Beatles used on their vocals! Fault is indispensable for hard rock and alt-rock productions, too. Create heavy sub-octave effects on room mics to send drums to the depths of Hell. Use the Frequency Shifters' FM controls to make a grand piano track sound like an electric keyboard under water. Or like tiny birds chirping. Fault knows no bounds.

Not getting the patterns you want with sine-based modulators? No problem – you can also modulate parameters or even other modulators with a full blown step sequencer, or effortlessly control multiple parameters in real time with simple gestures by using the new ROLI Lightpad controller integration.

Of course, Fault can also create all the conventional effects you need for everyday processing, including ping-pong delays, chorus, flanging and more. Independent stereo parameters facilitate the ability to broaden sounds while an internal M/S matrix allows for width control and optional output to Mid and Side components for further processing. But what sets Fault apart from other plugins is its ability to create startling, new sounds that can't be ignored. Hand out seatbelts—Fault will shake your listeners to their core.

Activate the fully functional 14-day demo with your Plugin Alliance account today to hear for yourself (no dongle required)!


  • Over 100 presets featuring settings from Richard Devine, The Crystal Method, Mirrorball Entertainment, and Toby Pitman of Air Studios
  • Artifact-free frequency and pitch modulation
  • Dual-channel Pitch Shifters can be stereo-linked and quantized to whole-integer semitones
  • Stereo Frequency Shifter can be modulated using high-resolution FM Frequency and Depth controls
  • Stereo Delays can be synced to host's tempo
  • Six feedback paths—three each for the Frequency Shifter and Delays—including cross-channel feedback
  • Unfiltered Audio's flagship modulation system provides eight freely assignable and fully automatable modulators with drag-and-drop virtual patching: sine LFO, sawtooth/triangle LFO, square-wave LFO, input follower, sample-and-hold noise, macro control knob, Step Sequencer, and ROLI Lightpad
  • Mid/Side processing adjusts stereo image from mono to super-wide, and provides optional output in M/S for further processing
  • High Pass and Low Pass filters can be switched to process just the wet signal or both wet and dry
  • Dry/Wet control provides parallel processing
  • Built-in soft clipper, anti-aliasing filters, low-fi sampling rate control and ring-modulator mode
  • New 25 Hz high pass filter option for improved shifter performance
  • Improved pitch shifter, available through the Options menu
  • Expanded choice of interface scaling options
  • Randomize Preset feature
  • Now includes an OpenGL toggle switch, for Windows users with unsupported graphics cards

Audio Examples

Industry Reviews

  • Mr. Bill
    Mr. Bill

    This thing has given me some of the craziest textures I've heard in a minute!

  • Adam Collins
    Adam Collins

    Fault can dismantle any sound. Pitch changes are very clean and the frequency shifter is perfect for harmonies or messing sounds right up. Added delay, filter and ring modulator give you… Read More

  • Rogerio Jardim
    Rogerio Jardim

    I’ve been messing around with Fault on my tracks, and I’ve been very impressed with its super creative processing. So far I am using it on drums, horns, guitars… It’s… Read More

  • Greg Wurth
    Greg Wurth

    Fault is an intriguing plugin because it offers an infinite amount of possibilities to create sounds that I would have never imagined or created elsewhere. I am always on the look out for… Read More

  • Scott Kirkland
    Scott Kirkland

    It’s like you recorded your sounds to a cassette tape and left it on your car dashboard in the hot sun until it got all warbly and degraded. That’s only part of what's so great about… Read More

Customer Reviews

  • ★★★★★
    by Mpressor
    I really enjoy the sound of fault with it’s smooth performance and lots of depth , I like the 3 different
    Sections to shape sounds and do lush harmonies. Of course we can’t forget about… Read More
  • ★★★★★
    Emergent properties
    by Levendis
    Hard to anticipate the effect of this effect, especially with its feedback matrix and FM path. Step-by-step repitching of sound may come as expected. Within a single parameter adjustment, however,… Read More
  • ★★★★★
    Crazy cool plugin
    by SongsByGROVER
    This makes loads of wild sounds. If you have a boring sound, run it through this and flick through presets to get something new and fresh. Then blend with wet/dry if you want subtle.
    My… Read More
  • ★★★★★
    by moodZoo
    I don't know what it is, but mah lawd it's fun to play with!!
  • ★★★★☆
    by J
    Top plugin for sonic butchery or even for more subtle work if you can restrain your self enough that is.
    Not the best tool for more moderate tweekage, a bit to complex for speedy work (too… Read More


  • Computer Music Innovation Award
    Computer Music Innovation Award

    In 2016 Fault received the Innovation Award from Computer Music Magazine

  • Computer Music Performance Award
    Computer Music Performance Award

    In 2016 Fault received the Performance Award from Computer Music Magazine


Supported Plugin Formats
AAX Native, AU, VST2, VST3

Supported Operating Systems
Mac OS X 10.9 through 10.13
Windows 7 through 10
Pro Tools 10.3.10 or higher or most VST/VST3/AU-compatible hosts running on a supported operating system

Intel CPU only (minimum 2 GHz recommended)

Intel-compatible CPU with SSE2 instruction set (Pentium 4 compatible or higher; minimum 2 GHz recommended)

System Requirements
Display resolution: 1440 × 900px or 1280 × 960px or higher
Memory: 2 GB RAM


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