Hey, I'm Fred developer of FAC

We share the same passion: MUSIC. A wonderful universal language and an amazing source of happiness.

FAC is a one person business, and as you may guess designing such apps is a very long process.



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BANDIT Fred Anton Corvest

Multiband Audio processing, apply effect with different setting in each band

Download on the App Store
  • Multiband effect processor
  • DJ style bands isolator with crossover control
  • Each single band provides its own effect with mix blending control
  • Comes with built-in effects: Saturator, Lofi and Ring Modulator
  • Extendable, more effects via In-App purchase (Delay and Reverb)
  • Include various presets for inspiration
  • Suitable for any situation, going from subtle to drastic change
  • Multiple Outputs support
  • iOS Audio Unit V3
  • Leave a ★★★★★ review on the
  • App Store

Main features

FAC Bandit is a multiband audio effect that splits the audio signal into three bands of frequencies defined by adjustable crossover points. Each band is processed independently by its own effect processor and the outputs are then recombined to produce the final effect.

Each frequency range is altered with different effects and settings that won't sound the same if applied on the full frequency range. As you have probably realized, FAC Bandit is a wonderful and powerful sound design tool for designers who want to sculpt new personal, exciting and outstanding sounds. Either in a subtle way, without compromising the original tone, or in a more drastic way.

Following the diagram below, the input sound is split into three bands (Low, Mid, High) which are then recombined to the output.

The three band sections provide: an output gain control, a mute/solo toggle and a dynamic fx slot. The crossover, for its part, is available in the second band section. Both the gain and mute/solo parameters can be used as band killer, like in DJ console.

Saturation: Tube-like distortion

  • Drive - amount of saturation applied on the pre amplified signal
  • PreGain - pre amplification of the drive section
  • Pre/Post Filter - cutoff of the filter according the model
  • Soft - soft clip before the drive, then post LPF
  • Hard - hard clip before the drive, then post LPF
  • BPF - pre BPF, then soft clip before the drive
  • BELL - pre BELL, then soft clip before the drive

LOFI: Low resolution character of retro vintage samplers

  • Rate - down sampling rate. 1: none, 40: resampling SR of 1102hz
  • Bits depth - resolution of each individual sample involved in the resampling process
  • Filter - post LPF. Useful to reduce the artifacts generated by the decimination
  • Classic - classic quantization
  • Dither - classic quantization with dithering noise applied
  • Rizer - advanced quantization, great down to 1 bit depth!
  • Jitter - classic quantization with fixed down sampling jitter

Ring Modulator: Add inharmonic content to your input signal and get great percussion, metallic or bells sounds

  • Note - sets the rate (midi note number) of the modulator. Use it as the root scale, great on jamming and getting tuned percussion
  • Waveshape - shape of the modulator waveform: SIN/SQUARE
  • Tone - LPF affecting the modulated signal, useful to reduce the artifacts generated by the process
  • RM 01 - single ring modulator
  • RM 02 - dual ring modulator

Delay: Tempo based delay, provides depth and ambience (In-App Purchase: 3 fxs 9 presets)

  • Feedback - the amount of altered signal returned into the input
  • Division - the delay time as beat division
  • Color - the width of the band pass filter. Computed according the band boundaries
  • Ping Pong LR - Echoes bouncing from left to right channel
  • Inv Ping Pong - Echoes bouncing from right to left channel
  • Stereo Echo - Classic echo. Keeps the stereo image untouched

Reverb: Recreate the sonic ambience of rooms and spaces (In-App Purchase: 5 fxs 14 presets)

  • Size - the dimension of the room or space
  • Pre Delay - the time (as beat division) between dry and wet signal
  • Damp - set the damping of the high frequencies
  • Small - Add a sense of small space, less noticable
  • Room - Natural room with fast decay
  • Hall - Wider than the Room model with a longer decay
  • Big - Large space with medium diffusion and long decay
  • Abyss - Wider than the Big model with more diffusion

Multiple Outputs support

An additional Audio Unit extension named FAC Bandit (MULTI OUT) provides multiple outputs support (Low, Mid, High bands can be routed to individual output in your AU host). Warning: to use this additional extension you need an AU host supporting multiple outputs (AUM, ApeMatrix). If not, use the regular FAC Bandit Audio Unit extension.

Preset Management

FAC Bandit also comes with factory presets to provide you a source of inspiration to satisfy your needs in any situation you might require.

The preset button provides common management features: loading, organization, and saving. The left and right arrows allow fast navigation shortcuts among all the presets (factory + user), a short press on the center label provides a detailed list of all the available presets, select the one you want to work with. On the other hand a long press (hold) provides contextual operation. For factory presets it's possible to save the current preset to a user preset, for user presets it's possible to rename, save and delete the current preset.

In-App purchase via the store available in FAC Bandit host

Lauch the Main App, touch the INFO button and select "In-App Purchase". Then, to buy a new product:

FAC Bandit --- Techno JamFAC Bandit And Ruismaker Noir Techno Jam FAC Bandit --- Garage BandFAC Bandit GarageBand Overview FAC Bandit --- Demo And TutorialFAC Bandit Demo And Tutorial
(The Sound Test Room)
FAC Bandit --- NS2 And FAC Bandit Equals Amazing Drums/BassNS2 And FAC Bandit Equals Amazing Drums/Bass
(The Sound Test Room)
FAC Bandit --- IAP Delay DemoFAC Bandit IAP Delay Demo
(The Sound Test Room)

FAC Bandit - NS2

FAC Bandit - Garage Band

FAC Bandit - AUM

FAC Bandit - Cubase

Check out what musicians think about FAC Bandit

I really REALLY love this plugin. Especially hard saturator on extreme settings, just beautiful distortion... this plugin goes instantly to my TOP 10 best plugins on iOS.. I have installed actually just 12 effect plugins on my iPad but 3 of them are FAC stuff :))


Really transforms the original audio source in whatever direction you want. Another great FAC app.

Plu Collective

One of the apps I have fallen for like really hard is FAC Bandit...


Love it. So nice playing with the high end and muting the bands.

Oat Phipps

Wow this is a really impressive effect. The processing between the separate bands sounds suuuuper clean. This will be my new goto to beef up drums.


Download on the App Store