Comparison

FAC Alteza vs MidiStep

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

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.

Highlights
  • 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
Read full description

• 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

About

MidiStep

Create complex rhythms and generative music with a powerful step sequencer. Control randomization for notes, chords, velocity, and more to generate unique, ever-changing musical patterns. Automate synth parameters with independent modulation lanes.

Highlights
  • User-controlled randomization for musical parameters
  • Polyphonic chord playback per step
  • Variable step sequence lengths
  • Multiple linked patterns
  • 8 independent modulation lanes
  • Real-time modification of randomization
Features
Read full description

MidiStep is a powerful and inspirational polyphonic step sequencer, and a dream for lovers of complex rhythms and generative music creation tools. The program uses sophisticated, user-controlled randomization to generate notes with a variety of parameters, including note values, note length, chords, patterns, velocity, gate, dividers, repeats, swing, and many more. You have complete control over what, when, and how much is randomized on a step-by-step basis. You can easily create patterns that have little to no variation, patterns that maintain a recognizable pattern but have some degree of variations to the notes, velocity, etc., all the way to patterns with extreme randomness with every pass – the degree of randomization is completely under your control for every parameter and for every step of a pattern. Features include per-step polyphonic chord playback, variable step sequence lengths for all parameters such as pitch, octave, velocity, note duration, beat divisions etc, and the capability to create multiple patterns which can be linked together in various ways. MidiStep also features 8 additional modulation lanes with independent play speeds. These can be used to automate parameters within your favourite synths. MidiStep uses sophisticated randomization settings for note values, note lengths, velocity, gate, dividers, repeats, swing, pitch bend and modulation. In addition, by setting different cycle lengths, step skips, step repeats, jumps, rewinds, cursor positions, pattern jumps, octave shifts, and many other parameters, you can create an infinite number of non-repeating sequences. The degree and types of randomizations for each of these parameters is up to you! Aleatoric music, also known as chance music, allows you to create patterns and entire compositions with user-controlled randomisation. The word 'aleatory' is derived from the Latin word 'alea' meaning dice. MidiStep allows you to turn on/off randomisation on a stepwise basis for almost all parameters, set the percent probability that the randomisation will occur, set min/max values, set exactly which parameters will be randomized, etc. The exact realization of the music will vary with each pass of the sequence, resulting in unique and captivating aleatoric renditions. All randomization controls can be modified in real-time. Features include: •Each of the 16 sequences can have unlimited types and degrees of randomness that you control. •8 independent sequencer lanes: Notes, Chords, Octaves, Velocity, Gate, Divider, Repeat, Delay. •8 independent Modulation sequencer lanes. •16 Patterns and 4 types of pattern switching, independent for each pattern. •Up to 16 steps per pattern, 16 patterns, and 16 cycles per pattern for a maximum sequence length of 4096 notes. •Independent sequencer length (1–16 steps) for each of the 16 lanes. •A Master step cursor independent of all other lanes. •Independent randomization parameters for each of the 16 lanes, with probability, min/max values, default values, skips, repeats, etc. •Unlimited variety of sequences, from slight variation to wildly different sequences on every pass. •126 scales and 126 chords – in every key, along with a scale and chord editor for you to create your own. •Chord complexity for 2–8 note chords, with notes specified or randomly generated. •Chord Articulation options – Block chords, Strum up/down, Arp up/down – with accent, length, speed, and random note order parameters. •Master lane and Chord lane previews. •Pattern Creator - automatic melody, chord, bass and drum backing. •Auto-scroll chord lane. •7-octave range for notes and chords (from C1–C8), with static and random octave offsets. •11 note lengths – from 1/32 note to 4 full measures, plus ties across notes, rests, repeated notes, and delays. •Two types of Swing with adjustable offset. •Humanize settings for note velocity and note timing. •Transposition of sequences using a keyboard – mono for single notes, and poly for chords.

Screenshots

FAC Alteza4 screens
MidiStep4 screens

Verdict

The call

The clearest difference is in-app purchases: MidiStep at none against FAC Alteza's 3. MidiStep also leads on update cadence (every 2 weeks vs every 5 months) and price ($7.99 vs $9.99). FAC Alteza's advantage is review sentiment (94% vs 81%) and ratings volume (81 vs 26). On rating, 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

CostPrice · In-app purchases · Ads · Monetization

FAC Alteza costs $9.99 and MidiStep $7.99 up front. FAC Alteza sells 3 one-off in-app purchases. MidiStep asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.9 for FAC Alteza against 4.8 for MidiStep. Both are backed by a comparable volume of ratings — 81 and 26 respectively. Written reviews are what separate them: 94% of FAC Alteza's written reviews are positive against 81% of MidiStep's.

UpkeepUpdate frequency

FAC Alteza ships an update every 5 months, MidiStep every 2 weeks. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

Scorecard5 real differences · 5 level
FAC Alteza versus MidiStep: the parameters behind the verdict, then further details
ParameterFAC AltezaMidiStep
Price$9.99$7.99 — better
Rating4.9 (81 ratings) — better4.8 (26 ratings)
Positive reviews93.9% of reviews — better81.3% of reviews
Number of ratings81 — better26
Update frequencyEvery 5 monthsEvery 2 weeks — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidPaid
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS13.013.0
Further details — not scored
Size3 MB44 MB
Age rating4+4+
DeveloperFrederic Corvest4Pockets.com

Customer experience

FAC Alteza

All ratings81 ratings
Positive97.5%
Neutral1.2%
Negative1.2%
Written reviews49 reviews
Positive93.9%
Neutral4.1%
Negative2.0%

MidiStep

All ratings25 ratings
Positive96.0%
Neutral0.0%
Negative4.0%
Written reviews16 reviews
Positive81.3%
Neutral0.0%
Negative18.8%

Bugs and 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

MidiStep

Not enough reviews yet to summarise bugs or requests.

In-app purchases

3 purchases

FAC Alteza

One-time3
  • Small Tip$1.99
  • Medium Tip$4.99
  • Large Tip$14.99
None

MidiStep

No in-app purchases

Questions

Is FAC Alteza free?
FAC Alteza costs $9.99, and also offers in-app purchases.
Is MidiStep free?
MidiStep costs $7.99, with no in-app purchases.
Which has better reviews, FAC Alteza or MidiStep?
FAC Alteza is rated higher. FAC Alteza averages 4.9 out of 5 from 81 ratings, while MidiStep averages 4.8 from 26 ratings.
Do FAC Alteza or MidiStep have ads?
Neither FAC Alteza nor MidiStep shows ads.
Which is updated more often, FAC Alteza or MidiStep?
FAC Alteza ships an update every 5 months, and MidiStep every 2 weeks. Most recently, FAC Alteza was updated on October 24, 2026 and MidiStep on October 25, 2026.

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