MINI-COMPOSER by Karl Bartos is a free music app created by Karl Bartos, an electronic musician and former member of KW, and Masayuki Akamatsu, a media artist and author of various iPhone apps. This app is a 16-step music sequencer that aims to provide a simple and enjoyable music-making experience.

The app features a 16-step sequencer that allows users to create their own musical sequences. It also includes a start/stop function to control the playback of the sequence. With multi-touch note input, users can easily input notes and create melodies. The app offers 32 polyphonic tones and 1 drum track, allowing for a wide range of sounds and musical possibilities.

MINI-COMPOSER provides 4 different waveforms - saw, triangular, square, and sine - that users can choose from to create various sounds. It also offers 4 drumbeat loops and the option to turn drums on or off. For added convenience, the app provides features such as random notes and clear notes to assist users in their music creation process.

Additionally, MINI-COMPOSER supports Wi-Fi sync play, allowing users to synchronize their sequences across multiple devices. It is worth noting that Wi-Fi connection is not necessary if only one iOS device is being used.

Overall, MINI-COMPOSER by Karl Bartos is a free and easy-to-use music sequencer that offers a range of features for users to create their own music compositions. Whether you are a music enthusiast or just looking for a fun way to pass the time, this app is worth checking out.