# MINI-COMPOSER by Karl Bartos — and Masayuki Akamatsu

> Free 16-step music sequencer with synth waves and drum loops. (iPhone/iPad app by Masayuki Akamatsu.)

- Source: https://appshunter.io/ios/app/mini-composer-by-karl-bartos/id427541594 (this page in markdown: same URL + `.md`)
- Developer: [Masayuki Akamatsu](https://appshunter.io/developer/284722836)
- Category: Music, Entertainment
- Price: Free
- Rating: 3.90/5 from 24 App Store ratings · 40 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 16 MB
- Languages: American English
- Released: 2011-03-26
- Data updated: 2026-08-24
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/mini-composer-by-karl-bartos/id427541594/reviews.md

## What is MINI?

Karl Bartos (electronic musician, ex-KW, co-composer of songs like The Robots, The Model, Computer World,...) and Masayuki Akamatsu (media artist and author of various iPhone apps such as Banner, Oscillator, Echochops,...) create a 16 step music sequencer which is free, simple and fun. The executive producer is Jean-Marc Lederman.

We have created this simple music app for fun: it implements the basic waves of a synthesizer with a 16 step sequencer. This app is completely free, but we would be glad if you would consider a donation to the Red Cross. In 2011, the year we were making this app, the Great East Japan Earthquake struck, and we released it as donationware to support the people affected. The damage from that disaster has still not fully healed, and disasters have continued to occur around the world since then. We continue to ask for your support.

This application has the functions listed below.
 
- 16 steps sequencer 
- Start/stop sequence
- Multi-touch note input
- 32 polyphonic tones + 1 drum track
- 4 waves (saw, triangular, square, sine) 
- 4 drumbeat loops
- Drums on/off
- Random notes
- Clear notes
- Additional information

Please enjoy our music and think World.


【ミニ・コンポーザ】

カール・バルトス(電子音楽家、元KWのメンバーでロボットやモデル、コンピュータ・ワールドなどの共作者)と赤松正行(メディア作家、BannerやOscillator、Echochopsなど様々なiPhoneアプリの作者)は、シンプルで楽しい16ステップ・ミュージック・シーケンサを作りました。エクゼクティブ・プロデューサはジャン=マルク・レダーマン。

私たちはこのシンプルなアプリで音楽を楽しんでいただくために作りました。基本的なシンセサイザー波形を持った16ステップのシーケンサが組み込まれています。このアプリは完全に無料ですが、赤十字へのご寄付を検討していただけると嬉しいです。このアプリを制作していた2011年に東日本大震災が起こり、被害者支援のために私たちはこのアプリをドネーションウェアとしてリリースしました。その被害はまだ回復していませんし、その後も世界各地で災害が起こっています。引き続きご支援をお願いする次第です。

このアプリケーションは次の機能を持っています。

- 16ステップ・シーケンサ
- シーケンスのスタート / ストップ
- マルチタッチでのノート入力
- 同時発音数32音のトーンと1トラックのドラム
- 4種類のウェーブ・フォーム(ノコギリ波、三角波、矩形波、サイン波)
- 4種類のドラム・ループ
- ドラムのオン / オフ
- ノートのランダマイズ
- ノートの消去
- 補足情報

どうか私たちの音楽を楽しむとともに、世界に思いをはせてください。

【ご注意】MINI-COMPOSERを起動した後にWi-Fiをオンにすると、Wi-Fi接続まで30秒ほどかかる場合があります。従いまして、MINI-COMPOSERを起動する前にWi-Fi接続を行うことをお勧めします。1台のiOSデバイスを使用される場合は、Wi-Fi接続は不要です。

## Key features

- 16-step sequencer
- Multi-touch note input
- 32 polyphonic tones + 1 drum track
- 4 synthesizer waves
- 4 drumbeat loops
- Wi-Fi sync play

## Recent user reviews (10 of 40)

All indexed reviews: https://appshunter.io/ios/app/mini-composer-by-karl-bartos/id427541594/reviews.md

### 5/5 — It’s fun and it’s free...

*2026-07-17*

It’s fun and it’s free. Apart from a function to record/save your compositions [which is not included] what else do you need ? 
I like to ‘compose’: airport/airline IATA/ICAO codes*, abbreviations, short words, numbers, symbols, etc., and listen to them.

* I work at London Heathrow Airport [LHR/EGLL] so that is an advantage!

### 2/5 — Not working anymore

*2021-01-22*

A great, adorable app. 
Sadly not working anymore.
January 2021.

### 1/5 — iPhone X issue

*2019-12-26*

Seems to shut down on some more complicated stuff.

### 5/5 — Awesome Game

*2019-01-03*

Free, simple, easy to use and fun. It’s awesome!

### 1/5 — Nur Spielerei

*2015-12-25*

Leider kann man nichts speichern oder bearbeiten. Nur rumspielen ist zu wenig.

### 3/5 — sehr minimalistisch

*2014-11-17*

...für Ideen im Stil von Kraftwerk reicht's, mehr ist aber nicht drin.

### 5/5 — Thanks again...

*2014-01-22*

...to Masayuki Akamatsu too, of course!

### 4/5 — Simple and fun, but emphasis on simple

*2013-07-27*

This is a fun little step sequencer that has you creating music in seconds flat. My only complaint is it might be a little too simple. There are very few presets, a rather small grid and no option to import your own sounds. Without those features this is little more than a toy. That said, I assume it was the intent of the appmaker to create something basic and fun. If that is the case, this is a success.

### 4/5 — センスの良さはさすが™...ARTです

*2013-06-30*

これは作品です。音もグラフィックもカッコいい 何をやっても凄いんだね
📡Morse code signals spelling out
"R-A-D-I-O-A-C-T-V-I-T-Y"
Chernobyl, Harrisburg, Sellafield Fukushima  今すぐやめろ!

### 5/5 — works...

*2012-10-20*

nice one...

## Frequently asked questions about MINI

### What is MINI-COMPOSER?

MINI-COMPOSER is a free 16-step music sequencer developed by electronic musician Karl Bartos and media artist Masayuki Akamatsu. It allows users to create music using basic synthesizer waves and drum loops.

### Does MINI-COMPOSER have ads?

No, MINI-COMPOSER is completely free of charge and does not contain advertisements.

### What devices does MINI-COMPOSER support?

MINI-COMPOSER is available for iPhone, iPad, and iPod touch devices.

### How can I sync MINI-COMPOSER with other devices?

MINI-COMPOSER supports Wi-Fi sync play, allowing multiple devices to play sequences together. It's recommended to connect to Wi-Fi before launching the app for a smoother connection.

### What kind of sounds can I create with MINI-COMPOSER?

You can create music using 32 polyphonic tones with 4 different wave forms (saw, triangular, square, sine) and 4 drumbeat loops. You can also control drums on/off and randomize notes.

### Is MINI-COMPOSER suitable for beginners?

Yes, the app is described as simple and fun, making it accessible for beginners interested in music sequencing.

### When was MINI-COMPOSER last updated?

The latest version of MINI-COMPOSER was released on October 24, 2017.

### What is the age rating for MINI-COMPOSER?

MINI-COMPOSER has an age rating of 4+, making it suitable for a wide range of users.

## Version history (last 5 releases)

### 1.2.2 — 2026-08-22

- Fixed a layout issue where the content appeared off-center on Mac.
- Changed the application name to "MINI-COMPOSER".

### 1.2.1 — 2026-07-07

- Minor bugs have been fixed.
- Removed the Wi-Fi sync play feature.

- 軽微なバグを解消しました。
- Wi-Fi同期演奏の機能を削除しました。

### 1.2.0 — 2017-10-24

このAppはApple Watch Appのアイコンを表示するようAppleにより更新されました。

iOS 10 and later compatible

### 1.1.1 — 2011-12-13

- Minor bugs fixed
- Set the supported iOS version to 3.0 and later.

- マイナー・バグ・フックス
- サポートするiOSのバージョンを3.0以降としました。

### 1.1.0 — 2011-12-02

- Native support for iPad (as a universal app)
- Wi-Fi sync play (with multiple iOS device)

- iPadのネイティブ・サポート（ユニバーサル・アプリとして）
- Wi-Fi同期演奏（複数のiOSデバイス使用時）

## Apps similar to MINI

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Sound Generator Lab](https://appshunter.io/ios/app/sound-generator-lab/id6758279358) | — | Free | Music |
| [波動 Hysteric Oscillator](https://appshunter.io/ios/app/hysteric-oscillator/id1473229854) | 4.0 (7) | Free | Music |
| [BLEASS Alpha Synthesizer](https://appshunter.io/ios/app/bleass-alpha-synthesizer/id1476042892) | 4.9 (107) | $14.99 | Music |
| [作詞作曲支援ツール：カラオケメーカー](https://appshunter.io/ios/app/id6747185447) | — | Free | Music |
| [TC-Data](https://appshunter.io/ios/app/tc-data/id883788579) | 4.7 (15) | $19.99 | Music |
| [BLEASS Groovebox](https://appshunter.io/ios/app/bleass-groovebox/id1220444178) | 4.3 (38) | Free | Music |

## More apps by Masayuki Akamatsu

- [Yes\|No Free](https://appshunter.io/ios/app/yesno-free/id284722833)
- [Alarm Free](https://appshunter.io/ios/app/alarm-free/id284728433)
- [Compass Free](https://appshunter.io/ios/app/compass-free/id284735786)
- [picocalc](https://appshunter.io/ios/app/picocalc/id284740333)
- [Gengou Lib](https://appshunter.io/ios/app/gengou-lib/id284830543)
- [T4Two](https://appshunter.io/ios/app/t4two/id284910005)

All apps by Masayuki Akamatsu: https://appshunter.io/developer/284722836

---

*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 2026-08-24.*