# MidiStep — Aleatoric Step Sequencer

> Polyphonic step sequencer for generative music creation with user-controlled randomization. (iPhone/iPad app by 4Pockets.com.)

- Source: https://appshunter.io/ios/app/midistep/id6680182647 (this page in markdown: same URL + `.md`)
- Developer: [4Pockets.com](https://appshunter.io/developer/370131860)
- Category: Music
- Price: $14.99
- Rating: 4.80/5 from 25 App Store ratings · 16 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 44 MB
- Languages: American English
- Released: 2024-10-12
- Data updated: 2026-08-17
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/midistep/id6680182647/reviews.md

## What is MidiStep?

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.

## Key features

- 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

## Recent user reviews (10 of 16)

All indexed reviews: https://appshunter.io/ios/app/midistep/id6680182647/reviews.md

### 1/5 — Where is the Auv3 plugin?

*2026-05-14*

Where can I download the audio unit component so I can use this with my DAW? It is useless without it and I can’t find it anywhere

### 5/5 — A very good sequencer that’s easy to learn

*2026-04-27*

It has pretty much every feature I would want from a hardware sequencer. The one feature that would be a huge addition would be very basic direction options, or am I not seeing them? I see the random step button, but no backwards or back and forth direction options. Other than that maybe adding sixteen more steps, but I realize with every sequencer you simply have to accept its limitations and embrace its strengths.

### 5/5 — Thanks for the app

*2025-08-23*

As many have already mentioned MidiStep and Helium are a powerful combination.

### 1/5 — The app is crashing

*2025-08-19*

Please check the app to work properly under iOS 15.8.4 and IPhone 7 Plus, in standalone mode it’s crashing after a while and the interface is empty and won’t load. In AUM it loads though. And I wasn’t able to find where to leave a feedback.

### 5/5 — The Joy of MidiStep

*2024-12-25*

MidiStep is amazing. Combined with Helium it is phenomenal. Not to say it was impossible before, but now I finally feel I have a great workflow with a combination of tools that I can use to finish full tracks in AUM.

### 5/5 — Insanely good, insanely deep

*2024-11-26*

Beautiful tutorials for this lil fella all over YouTube.  It’s pretty incredible in respect to what it can do and how complex.   It’s got that stable 4pocket gui, it compliments Helium nicely.

### 5/5 — Best step sequencer for the iPad

*2024-11-25*

There are many step sequencer for the iPad and I’ve got most of them. 
In terms of usability and “musicality”, this one really shines very bright.
Even if you barely use all those randomization options, which are phantastic, this step sequencer is very useful. The chord function is just great. 
Since I have it, I use it in every project (together with Octachron for drums and percussion). 
Thanks Paul!

### 5/5 — Another winner!

*2024-11-23, version 1.06*

The mind of Paul (developer of this and so many other apps) must be lit up like a radar screen at a major airport! As usual, there is a LOT on offer, and updates that add even more. Sometimes the complexity is a bit overwhelming, but well worth persevering and this is easily among his top 5 greatest apps. A fine addition to any music-maker’s collection.

### 5/5 — A versatile step sequencer for Berlin School jamming

*2024-10-21*

I love this sequencer that very much resembles the typical analog sequencer setup plus loads of very useful randomisation features. And another app that runs on older (iOS 12) devices - great! But please do not just hide disabled notes. I often prepare or change disabled sections of sequences before enabling them again. I suggest the same “ghost note” behaviour as in Tie mode. The same applies to sequence length: The unused sections of sequences that are shorter than 16 steps should be visible and adjustable. Another great feature would be another sync mode that advances the sequencer when a NoteOn arrives without any set tempo.

Just to add to this review that the latest update implemented the requested features. Fantastic 👍

**Developer response:** Thanks for the suggestions. I will add them to my ever expanding list and hopefully you will see these make their way to a future release. I have many great ideas I am working on that I think everyone will appreciate, but its always great to get possitive feedback which encourages me to keep the updates coming.

### 5/5 — Best app so far from Paul

*2024-10-19*

I bought this a little while ago, and I’ve been playing with it in AUM. I’m impressed!

## Frequently asked questions about MidiStep

### What is MidiStep used for?

MidiStep is a polyphonic step sequencer designed for creating complex rhythms and generative music. It allows users to control randomization of various musical parameters to generate unique and evolving sequences.

### How much does MidiStep cost?

MidiStep is a paid application priced at $8.99. There are no in-app purchases or advertisements.

### What devices does MidiStep support?

MidiStep is available for iPhone, iPad, and iPod. It is rated for ages 4 and up.

### How often is MidiStep updated?

The latest version of MidiStep is 1.13, last updated on December 2, 2025. This indicates a relatively active development cycle.

### Can MidiStep create non-repeating sequences?

Yes, MidiStep can create an infinite number of non-repeating sequences by utilizing various randomization settings, cycle lengths, step skips, and pattern jumps.

### What kind of randomization does MidiStep offer?

MidiStep offers sophisticated randomization for note values, note lengths, velocity, gate, dividers, repeats, swing, pitch bend, and modulation. Users can control the degree and types of randomization for each parameter.

### What are the user reviews like for MidiStep?

MidiStep has received excellent user feedback, holding a perfect 5.0-star rating from 22 ratings, suggesting high user satisfaction.

### Can MidiStep automate synth parameters?

Yes, MidiStep features 8 additional modulation lanes with independent play speeds that can be used to automate parameters within your favorite synthesizers.

## Version history (last 5 releases)

### 1.13 — 2025-12-02

v1.13 B191
Fix for UI issue on some devices using iOS26.1.

### 1.12 — 2025-11-20

v1.12 B190
Fixed toolbar content issue misalignment in iOS26.1 (due to bug in iOS 26.1 was fiine in 26.0)

### 1.11 — 2025-08-19

v1.11 B189

Updated in order to be compatible with future versions of iOS.

### 1.10 — 2025-04-02

v1.10 - B188

Fixed an issue with looping missing the first note of the loop after looping.

### 1.09 — 2025-01-09

v1.09 B187 - Release Candidate

Added a new Quick Start Guide courtisy of David Collett (There is a dedicated button within the Help Manual to the left of the 'Save as PDF' button).

The Pattern Creator settings are now saved with the session and reloaded when a session is loaded.

Pressing SHIFT + Rewind Pattern sets all patterns (works with notes and param lanes).

Fixed the issue of rotating the Accents in the Pattern Creator. We now rotate notes, velocity, octave and divider lanes in all modes.

Octave is now taken into account when previewing a step (experimental).

Fixed an issue with restoring Full Screen mode.

Added a new Next Pattern option called 'Random Group'. This randomizes any pattern adjoining the currently selected pattern which form a group.

There is a new option in the Settings Menu called Random Group Behaviour which determines if a random group can reselect the current pattern. It defaults to EXCLUSIVE (will not repeat the same pattern). The user can toggle it to INCLUSIVE (allows repeating the same pattern).

Added a new Step Record option. Long Press the 'Pause' button to enable Step Record, press again to exit.

## Apps similar to MidiStep

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Chordio: compose & learn music](https://appshunter.io/ios/app/chordio-compose-and-learn-music/id1580214821) | 4.4 (8) | Free | Music |
| [7XWAVE Sample Synth Loop Maker](https://appshunter.io/ios/app/7xwave-sample-synth-loop-maker/id1500808329) | 4.2 (10) | $2.99 | Music |
| [7XDXFM 4OP FM Loop Maker](https://appshunter.io/ios/app/7xdxfm-4op-fm-loop-maker/id1589435250) | 4.0 (6) | $2.99 | Music |
| [guitarscaper](https://appshunter.io/ios/app/guitarscaper/id1316544251) | 4.8 (21) | $1.99 | Music |
| [ANALOGyGR](https://appshunter.io/ios/app/analogygr/id6746485545) | 4.7 (10) | $2.99 | Music |
| [6X806 Drum Synth Loop Maker](https://appshunter.io/ios/app/6x806-drum-synth-loop-maker/id1444312256) | 4.6 (25) | $2.99 | Music |

## More apps by 4Pockets.com

- [Meteor Multitrack Recorder](https://appshunter.io/ios/app/meteor-multitrack-recorder/id417726727)
- [Tone Generator Ultra](https://appshunter.io/ios/app/tone-generator-ultra/id514273546)
- [PocketRTA Ultra](https://appshunter.io/ios/app/pocketrta-ultra/id514903914)
- [StompBox Band](https://appshunter.io/ios/app/stompbox-band/id845046209)
- [Audio Toolbox](https://appshunter.io/ios/app/audio-toolbox/id1353387223)
- [Audio Compressor AUv3 Plugin](https://appshunter.io/ios/app/audio-compressor-auv3-plugin/id1426387457)

All apps by 4Pockets.com: https://appshunter.io/developer/370131860

---

*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 2026-08-17.*