# FAC Alteza — Exospheric Stereo Reverb AUv3

> Exospheric stereo reverb with pitch shifting and advanced sound design features. (iPhone/iPad app by Frederic Corvest.)

- Source: https://appshunter.io/ios/app/fac-alteza/id1489369665 (this page in markdown: same URL + `.md`)
- Developer: [Frederic Corvest](https://appshunter.io/developer/1230164765)
- Category: Music
- Price: $9.99 with in-app purchases
- Rating: 4.90/5 from 81 App Store ratings · 49 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 3 MB
- Languages: American English
- Released: 2020-02-16
- Data updated: 2026-08-28
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/fac-alteza/id1489369665/reviews.md

## What is FAC Alteza?

• Exospheric stereo reverb with ultra low latency pitch shifting
• Amazingly lush, dreamy and beautiful
• Shimmer kind effect, harmonizer
• Unique feedback processor and fine tuning of the All-Pass delays
• High-pass filter and stereo width input controls, separate Dry/Wet outputs
• Sidechain input to duck the reverb
• Multiple outputs, extra output bus to route the feedback signal to your own fxs
• Advanced Responsive Design, portrait and landscape views
• 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 powerful 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 blend knob to control how much of the original signal is mixed with the feedback reverb
• the wet signal can be ducked by an external signal provided by the host

- AuV3 and Standalone App
- To use the sidechain and/or to output the additional feedback signal, you need a host able to provide to the AuV3 an input bus and an additional output bus.

The documentation is available at fredantoncorvest.com/FAC_Alteza.html

## Key features

- Exospheric stereo reverb
- Ultra-low latency pitch shifting
- Shimmer and harmonizer effects
- Unique feedback processor
- All-Pass delay fine-tuning
- Sidechain input for ducking
- Separate Dry/Wet and feedback outputs

## Pricing and in-app purchases

Base price: $9.99.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Large Tip | $14.99 | one-time |
| Medium Tip | $4.99 | one-time |
| Small Tip | $1.99 | one-time |


## Recent user reviews (10 of 49)

All indexed reviews: https://appshunter.io/ios/app/fac-alteza/id1489369665/reviews.md

### 3/5 — All the effects sound over the top

*2026-06-21*

I’m not sure if I’m doing something wrong but all the effects sound way too extreme. I just want a gentle reverb and everything is crazy! Would love it if the presets were toned down a lot more

### 5/5 — <3

*2025-11-23, version 2.4.3*

Such a magical reverb!

### 5/5 — Pure space✨

*2025-11-03*

FAC Alteza has been part of my recent sound work — I love how it opens up space in such a deep and emotional way. The shimmer feels organic, never artificial, and the interface is so intuitive that it invites instant creativity. Perfect for creating wide, dreamlike soundscapes, even for beginners.

### 5/5 — Perfect on iPhone

*2025-06-16*

A big and great thanks to the developer, because great sound is one thing but usage on the iPhone another story. The whole package of apps have a great sound and the AUM user interface changes if you are on iPad or iPhone. Perfect usability on iPhone!

### 5/5 — i want…

*2025-01-27*

…a hardware baby! By far my favourite reverb!

### 5/5 — Amazing!

*2024-11-28, version 2.4.3*

Great shimmering harmonic reverb with great tone!

### 5/5 — My go-to reverb

*2024-02-24*

I use a few different reverbs on the iOS platform, and must say FAC Alteza is the one that I reach for the most during my sessions. It is extremely versatile, and instantly adds life and atmosphere to any sound that you feed into it. It can give that otherworldly quality to the soundscape, in a similar way that an Eventide Blackhole does, but in a way that is entirely unique and unmistakable. It can turn a simple monophonic sound source into an expansive space of complex harmonic richness.

### 5/5 — Excelente

*2023-11-12, version 2.4.3*

100% recomendable

### 5/5 — Fantastic

*2023-08-20*

One of my favorite reverbs ever. Every FAC app would be an asset to your iOS production toolbag 💪🏾

### 5/5 — Ecstasy

*2023-07-06*

It's only the most beautiful reverb in the universe...and there is nothing else like it.  Pure audio love!

## Frequently asked questions about FAC Alteza

### What does FAC Alteza do?

FAC Alteza is an exospheric stereo reverb application that offers ultra-low latency pitch shifting. It is designed to create lush, dreamy, and beautiful sound textures, often described as a 'shimmer' effect, and can also function as a harmonizer.

### What are the key features of FAC Alteza?

Key features include an exospheric stereo reverb with ultra-low latency pitch shifting, a unique feedback processor for fine-tuning all-pass delays, controls for input stereo width, a high-pass filter, and a sidechain input to duck the reverb. It also offers separate dry/wet outputs and an extra output bus for the feedback signal.

### How much does FAC Alteza cost?

Based on the provided information, FAC Alteza is a paid application. There are no mentions of free versions or subscription models, indicating a one-time purchase.

### What devices is FAC Alteza compatible with?

FAC Alteza is an iOS Audio Unit V3 application, compatible universally with both iPad and iPhone. It can be used as a standalone app or within a host application that supports AUv3 plugins.

### What kind of music is FAC Alteza best suited for?

FAC Alteza is ideal for creating ethereal sound textures and dreamy space reflections, making it perfect for ambient music. It's also excellent for adding fabulous, angelic, evolving choir sections to any kind of music that requires such sonic qualities.

## Version history (last 5 releases)

### 2.4.3 — 2023-07-05

Maintenance Update

Support FAC • Rate and Review ALL of your FAC apps • Buy a t-shirt • Tip...

Contact: support •• fredantoncorvest.com

### 2.4.2 — 2023-04-20

Maintenance Update

Support FAC • Rate and Review ALL of your FAC apps • Buy a t-shirt • Tip...

- Fix side-chain, signal may be muted in some host
- Rename input/output busses (Sidechain, Feedback)

NEW: FAC Alteza Desktop Big Update! 
Get your favorite exospheric stereo reverb on macOS now!

Contact: support •• fredantoncorvest.com

### 2.4 — 2022-11-01

Maintenance Update and New UI

Support FAC • Rate and Review ALL of your FAC apps • Buy a t-shirt • Tip...

Contact me for any issues: fredantoncorvest.com/know_issues.html

• Fix sidechain knobs hidden on some devices
• General UI polish: new knobs, background...
• Various fixes and improvements

### 2.3.3 — 2022-05-14

Maintenance Update | Consider a Tip and write a review if you enjoy FAC Alteza | Contact me for any issues
• Fix crash when presets saved in AUM, Loopy Pro (via host preset manager)
• Fix restore/save state in standalone
• Various minor fixes and improvements

### 2.3.1 — 2022-04-18

Again another FREE update bringing fixes and NEW features, don't forget to tip and leave a review if you enjoy FAC Alteza !
Contact me for any issues.

• Full responsive UI
• New audio input widget (standalone app)
• Presets management improvement, import/export handled by the AuV3 (zip)
• User presets are now sorted
• Addition of Tip Jar view
• Fix not automatable parameters visible in some DAW

WARNING: Save your user presets (old version 1.2.3) before updating to this new version. 
Zip the export folder, you will be able to import the zip in the new version.
Check the procedure about how to export presets in the old version (1.2.3)

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## More apps by Frederic Corvest

- [FAC Chorus](https://appshunter.io/ios/app/fac-chorus/id1230164766)
- [FAC Maxima](https://appshunter.io/ios/app/fac-maxima/id1323117302)
- [FAC Transient](https://appshunter.io/ios/app/fac-transient/id1354088081)
- [FAC Envolver](https://appshunter.io/ios/app/fac-envolver/id1378195291)
- [FAC Bandit](https://appshunter.io/ios/app/fac-bandit/id1458633968)

All apps by Frederic Corvest: https://appshunter.io/developer/1230164765

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-28.*