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.



A small donation would show your appreciation and enthusiasm to keep this project moving along. Thank you

FAC MAXIMA Fred Anton Corvest

Acts like a super compressor or limiter to ensure levels stay below 0dB

Download on the App Store Download on the Mac App Store
  • Designed to provide automatic gain control of your input signal
  • Can be used on master or individual tracks, to finalise your tunes or to be creative
  • Provides precise dynamic control: threshold, reset time and make up (raise)
  • Adjustable detection algorithms and filters
  • Stereo Link, from dual mono to full stereo processing
  • Suitable for any situation, going from subtle to drastic changes
  • Multi-waveform graph of pre and post signal processing with 6 seconds buffer!
  • iOS AuV3 - Universal (iPad/iPhone)
  • macOS AuV3 - Supported by Logic Pro X, Garage Band, Hosting AU and Reaper

Main features

FAC Maxima is an audio effect designed to provide automatic gain control of your audio materials to ensure that the levels stay consistent and never exceed 0dB. It's a clever combination of dynamic processors that can be set to provide a gentle transparent signal boost respecting the initial dynamic or significant colorised level maximisation. Thanks to a unique signal path, algorithms and a small set of parameters, FAC Maxima makes a complicated task easy.

Following the diagram below, the sound flows from the left to right or from the input to the output.

  • Gain (up to 15db) Use it carefully

  • → Graph
  • Multi-waveform graph. Input signal upfront, processed output behind. 6 seconds buffer! Touch the graph to freeze the display temporarily.
Automatic Gain Rider
  • Threshold sets the level at which the detector starts working
  • Reset - time the detector takes to return to the detected level
  • Raise - gain compensation from none to full compensation
  • Detector modes - Slow, Mid, Fast, Inst (Instantaneous) and Sub (Safer mode)
  • Input filter modes - LCUT, HBST, Both or Clean
  • Link blend dual mono to full stereo signal processing
  • Dry/Wet mix signal control
  • Gain (up to 15db) Use it carefully
  • Bypass


Reset and Detector modes are key parameters to ensure that the quality of your signals remain high. Keep in mind that having Inst (Instantaneous) Detector modes and very short Reset time will lead to some artefacts in some context. They are provided to give versatility, the most secure approach is provided by the preset Master (La Donna). In other words slow detection and slow reset.

In addition to the classic final stage application, FAC Maxima excels on individual tracks too. With a few changes it's easy to go from the common gain deviation compensation, e.g. for vocals, to drastical audio changes that will bring your audio material to new territories: boost reverb tails, flattenize drums… The applications are various and the possibilities are limitless:

Get the final touch! Be creative! Go further!

As with all FAC products the interface has a unique sober look and provides a great user experience. FAC Maxima also brings a real-time multi-waveform graph having a 6s buffer of the audio material before and after operations, this will help on setting the right parameters and have a visual feedback.

Preset Management

FAC Maxima also comes with some factory presets to provide you a source of inspiration to satisfy your needs in any gain modifications you might require.

The preset button provides common management features: loading, organization, and saving. The left and right arrows allow fast navigation short cut 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.

Warning about the "Larsen effect" in the main iOS host app. In the input section, it's possible to choose a mic as input. This may cause audio feedback, check your levels to avoid any damage to your system. In general, use the gain and feedback in parsimony, to avoid any excessive levels that may damage your ears or your system. FAC Maxima shall not be liable for any loss or damage of whatever nature (direct, indirect, consequential, or other) to your material (software, hardware, or other).

Mastering in GarageBand on iPhone using FAC MaximaMastering in GarageBand on iPhone using FAC Maxima FAC Maxima iOS DemoFAC Maxima iOS Demo FAC Maxima The Sound Test Room ReviewFAC Maxima The Sound Test Room Review FAC Maxima --- OSX DemoOSX Demo

Music technology journalists

FAC Maxima - NS2

FAC Maxima - AUM

FAC Maxima - Garage Band

FAC Maxima - Logic Pro X

Check out what musicians think about FAC Maxima

It’s very very good, in fact I think it’s awesome, definitely one everyone should have. This is an app that is really needed, it’s simple and easy to use and doesn’t colour the sound in anyway, which is crazy important for a Limiter


Perfect, no distortion. I love it, a handy and essential mix tool. Hats off to you for another gem

Jake Kito

I’m playing around with it and with all kinds of Rozeta apps and an additional reverb. It’s great! Blows life into it very easy! I’ve tried a few maximizers limiters on iOS but none was so easy responding like yours. Great work!

Thomas Büchel

Another awesome app from FAC!!! This one gives a huge boost, while remaining completely transparent!!


Transparent and loud, a real asset that belongs in the mix chain. Thanks Fred, your apps are truly exceptional. Congrats and all the best

Lenny Parry

I have tested all top apps of the same kind against it, none could boost signals (differentiated) as good as FAC Maxima! Must have!

Jay Zen

Download on the App Store Download on the Mac App Store