• True stereo reverberator
• Amazingly lush and beautiful
• Shimmer kind effect, harmonizer
• Two ultra low latency pitch shifters
• All-Pass delays fine tuning of the main and feedback sections
• Two mixable input sources for the feedback section
• Independent Dry/Wet Control
• External Sidechain (only available in hosts supporting sidechain)
• Includes various presets for inspiration
• iOS Audio Unit V3 - Universal (iPad/iPhone)

Designed for ethereal lush sound textures and dreamy space reflection, FAC Alteza is the perfect solution to bring your instruments to heaven in no time. Thanks to a powerfull feedback section containing, inter alia, two pitch shifters, the unit is able to deliver the very typical "Shimmer" sound kind effect very much prized by musicians that are making ambient music, or any kind of music that needs to be carried by a fabulous angelic evolving choir section.

FAC Alteza is definitely not "another shimmer reverb..." effect because it comes with additional parameters that make it very versatile. A particular attention to each part of the signal path was necessary to reach this level of high-end quality.

Here some features that make FAC Alteza an outstanding unit:

• the input signal is not monoized by default, a knob allows to control the width of the input stereo image before reaching the reverb
• the topology of the effect, based upon a series of All-Pass delays, allows to control the intrasec characteristics of the reverberation
• the number of All-Pass delays per stage and the echo density are alterable in the main section and in the feedback section
• two ultra low latency pitch shifters deliver progressive pitch-shifting of the reverberation tail or the input signal
• the feedback section contains a source knob to control the source of the signal, from the original input to the reverb
• the wet signal can be ducked by an external signal provided by the host

What’s New

Version 1.1

• NEW: External Sidechain (only available in hosts supporting sidechain)
• Fix mixdown issue in Cubasis
• Minor UI rework

Ratings and Reviews

5.0 out of 5
19 Ratings

19 Ratings

WendysFrostyCarlos ,


Yet another winning creative audio application from the genius mind of Fred Anton Corvest. Easily equaling if not exceeding the capabilities of hardware & software reverb units priced exponentially higher than the incredibly reasonable cost of this app. Laden with features and includes all of the essential standard support in all aspects we’ve come to expect from this developer. Don’t hesitate on this one!

mbs1978 ,

The Sound Test Room review

After watching The Sound Test Room review of this in preview, I instantly put in on pre-order. I got it and ran it as soon as I could, and it does NOT disappoint! This effect is incredible, and is practically an instrument all by itself! Don’t pass this up.


gorgeous sounding wow 🤩

I’d have to say one of the best and if you’re familiar with the FAC apps you’ll know they are all quality and all great tools in a iPad musicians arsenal. Thx put a smile on my face when it was available for download a few days early 🙃 ....bliss


Frederic Corvest
36.7 MB

Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.



Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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