Midi Echo AU vs FAC Alteza
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Midi Echo AU
This app creates repeating MIDI note effects, similar to audio echoes but for digital music signals. It allows for independent control of note-on and note-off messages, offering extensive customization for musical expression.
- Selectable echo types (fixed, ping pong, taper)
- Adjustable number of echoes (0-20)
- MIDI velocity reduction for quieter echoes
- Define pitch interval for successive echoes
- Tempo sync or mSec delay time
- Set MIDI channel for echoes
- Disable individual echoes
- MIDI thru control
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AUv3 Midi Fx - Midi Echo online manual here: http:/amssoftware.org/manual/MidiEchoManual.pdf Note : AUv3 midi apps need a compatible host (AUM,Audiobus 3, Cubasis, BM3 etc). So what is a midi echo? It is similar to the audio echo effect where copies of the original audio are repeated at regular time intervals but with some form of change (e.g. quieter). But unlike audio, midi is digital in nature (low resolution 8 bit mostly) and focused around the midi note on & off message used to control synths etc. This app acts on midi note-on independently from the note-off but when the note – off appears it echoes the release of the note-on in the same way the note-on was echoed (pitch interval etc) even if the UI controls have changed. UI Controls exist to allow you to: * Select the type of echo (fixed, ping pong, taper) * Vary the number of echoes (from 0 to 20) * Make echoes quieter by reducing the midi velocity * Define the pitch interval (semitone) of all successive echoes * Select the delay time between echoes either tempo sync or in mSec * Define the delay type (fixed, tempo, random 50, random 20) * Set the midi channel of echoes (1-16) so that other synths can select the echo only * Disable individual echoes - to allow you to play chords with a small or 0 delay * Set Midi thru to keep/remove the original note messages * Panic button to quickly turn off all notes * Setup control automation as all controls are AU Parameters
FAC Alteza
This app provides an exospheric stereo reverb with ultra-low latency pitch shifting for lush, dreamy sound textures. It features a unique feedback processor, fine-tuning of all-pass delays, and advanced controls for stereo width and sidechain ducking. Designed for musicians seeking ethereal soundscapes.
- 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
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• 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
Screenshots
Verdict
The clearest difference is review sentiment: FAC Alteza at 94% against Midi Echo AU's 50%. FAC Alteza also leads on rating (4.9 vs 3.5) and ratings volume (81 vs 8). Midi Echo AU's advantage is price ($1.99 vs $9.99) and in-app purchases (none vs 3). On ads, monetization model and device support there is nothing between them.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Midi Echo AU costs $1.99 and FAC Alteza $9.99 up front. FAC Alteza sells 3 one-off in-app purchases. Midi Echo AU asks for nothing beyond the download.
FAC Alteza holds the better App Store score, 4.9 against 3.5. That said, the two scores are not equally well evidenced: FAC Alteza has 81 ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 50% of Midi Echo AU's written reviews are positive against 94% of FAC Alteza's.
Midi Echo AU ships an update every 6 weeks, FAC Alteza every 5 months. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.
| Parameter | Midi Echo AU | FAC Alteza |
|---|---|---|
| Price | $1.99 — better | $9.99 |
| Rating | 3.5 (8 ratings) | 4.9 (81 ratings) — better |
| Positive reviews | 50.0% of reviews | 93.9% of reviews — better |
| Number of ratings | 8 | 81 — better |
| Update frequency | Every 6 weeks — better | Every 5 months |
| Ads | No | No |
| In-app purchases | No — better | Yes |
| Monetization | Paid | Paid |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 — better | 13.0 |
| Further details — not scored | ||
| Size | 13 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | anthony saunders | Frederic Corvest |
Customer experience
Midi Echo AU
FAC Alteza
Bugs and requests
Midi Echo AU
Not enough reviews yet to summarise bugs or requests.
FAC Alteza
Reported bugs
2 issues- Not working on 2021 iPad as host
- Doesn't freeze properly in Cubasis
Requested features
4 requests- Presets toned down
- Encoders rotate slower for fine adjustments
- More presets
- MIDI control by foot switches
In-app purchases
Midi Echo AU
No in-app purchases
FAC Alteza
- Small Tip$1.99
- Medium Tip$4.99
- Large Tip$14.99









