As part of a study project together with a public school in Trossingen, I developed the free Android app PocketComposer. Based on earlier ideas about DAWs, workflow and inspiration and the way contemporary composers of new music like to work, the app starts with a nearly blank screen and an entry point. The design deliberately avoids a fixed grid for the rhythm (i.e., quantization), pre-recorded samples and fixed layout for your tracks.

Link to play store:

The composer can create new audio or synthesizer items anywhere on the zoomable canvas and record sounds directly with the phone or import .wav-files from the SD card or internal memory.


The audio/synth/break snippets are connected with arrows, so a composition is essentially a directed graph. Each edge on the graph can be traversed a limited number of times. When a node has multiple children (i.e., outgoing edges), more voices are automatically added and allocated to the player. The maximum number of voices is 16.


In the following days, pupils from the Gymnasium Trossingen will work with the app. I am eager to see some bad-ass compositions with everyday sounds and a little anxious because those 8th graders might be very tough beta testers 🙂

Please be aware that the app is still in an early stage of development and is rather a proof-of-concept than a well-forged, reliable composition tool. I hope to add improvements step by step later. Bug reports below in the comments, please!

The interface was made with the 2D cross-platform game engine LibGdx

The sound engine uses libpd/Pure Data.


Between September 2015 and June 2016, I was working on my final year project for the Musikdesign studies at Trossingen. It is essentially a single player audio game where the player’s movements are tracked inside a room.

The title of the game is “Morpheus’ stairs”. Morpheus as a reference to the ancient Greek God of sleep and dreams, stairs meaning that the player has to descend several layers (this is similar to the concept of early dungeon crawler games like Rogue and Nethack).

It is easiest to describe the whole game from the player’s perspective:

“I open the door labeled Morpheus Stairs and enter a room with blind windows, no lights except for the glow of a laptop in the corner. The game developer gives me a special kind of headphones with a small printed circuit board attached. To play the game, I have to wear a sleeping mask and stand the middle of the room. After a short calibration (presumably of the head and positional tracker), the game starts.
A whispering voice explains that I have to find a specific spot in the room and that I have to listen closely and walk carefully.

After the introduction, another voice says that I have to look for the prime, probably referring to the musical interval.

A piano starts to play two notes. After a while, I notice that the interval between the notes changes when I turn around. Once I have fixed a prime, I start walking towards it.
I am afraid to hit the walls (since I am not able to see anything). However, the tracking system detects the proximity of the walls very accurately and plays a clear acoustical warning.

Inside each level, I use different systems of acoustical navigation to zero in on the entrance to the next level. The whispering voice tells me how to navigate. In the seventh level, the voice is silent. I get confused and start to walk around, looking for the exit. The sound of a beating heart starts to get long louder and louder, hammering into my ears. Walking around, I seem to be close to a wall more and more often. Are the walls closing in on me? Are these acoustical warnings reliable anymore? Is the tracking system broken?

Bravely, I walk a few steps, disregarding the yelling sound telling me that there is a wall. Suddenly, the heart beat stops. Everything I have heard before is played backwards with a very high pitch. Then… silence except for the calm waves of the sea. Game over.

To experience the game yourself, you can download a standalone version for Mac OS X. In the standalone, the tracking system is replaced by playable third person character. You can see the room, but the exits are hidden.

There is also a video of a complete walkthrough:

The tracking system transfer the positioning data wireless to an Arduino device which is connected via USB to a Macbook. The USB data is read via an emulated serial port, translated to OSC packets and forwarded to the Unity application which you can see in the video on screen. Thus the real movements in the room are directly projected into the virtual room of the game.

This final year project would not have been possible without the support from many people, who tested early versions, provided hardware and provided advice on the content and game mechanics. Thank you!

One assignment in this summer’s composition course was to use the theme from the well-known medieval hymn dies irae, slightly modify it and create different variations based on the theme.

You can find the score as a PDF here:


The theme’s cinematic feel was exploited a lot, there are many movies where you can hear citations of the theme:

The following track was made as a homework assignment. As a group, we had drawn a “collective painting” on the blackboard – with more or less serious artistic intentions 😉 Afterwards, everybody should create a piece of music and/or sound design inspired by the picture. I choose a style I always wanted to try out and integrated the picture’s properties mostly as words describing different items.


On Wednesday, June 24, 7.30 pm, you are welcome to attend a very special concert at the University of Music, Trossingen, Germany.  Musikdesign-students cooperate again with the Sinfonietta ensemble to fill the concert hall with an all new sound. One of the pieces will be accompanied by a video mashup created by me specifically for the piece.

On Saturday, June 27, 8.30 pm, one of my pieces I composed and produced for the Musikdesign studies will be played at the Next Generation Festival 6.0 at the ZKM, Karlsruhe, Germany. The piece is called “Core Audio” and is essentially an immersive sonification of the programming game “Core Wars”. Using the “Klangdom” speaker setup with four subwoofers and more than 30 speakers distributed around and above the public, the piece puts the listener’s head directly into the digital chaos of an ongoing Core Wars tournament.


I will try to publish the visuals and the Core Audio sonification once the concerts are done.


Edit: this is a video of “Controversation”, Ron Freyenschlag’s final year project, played by the Sinfonietta Ensemble in Trossingen, conducted by Sven Kiebler. I used Reaper to control the video playback during the performance and a bit of PureData and Processing for the realtime-generated visuals.

During my second year at the music conservatory in Trossingen, I have worked together with two game design students from the National University of Singapore. There is a cooperation between Trossingen and NUS where Musikdesign students create soundtracks for animated films created by students in Singapore. The films are final year projects, as was “The Last Spark”, a video game. Since I am very interested in interactive (=game) music, I immediately picked the only game from the list of projects, instead of picking one of the films. The Last Spark is a 3D video game with horror and stealth elements. Its story is adapted from “The little match girl”, a tale by Hans Christian Andersen.

Apart from the composition and sound design tasks, I also integrated the sounds directly into the Unity project, which turned out to be very effective (once Hieu and me managed to come up with a git-based workflow, which took some time). Unity 5 is great for 3D audio and in-game mixing, but it lacks some important features to create interactive sounds. For larger projects, Wwise seems to be a good choice. In this case, I hacked a few scripts in C# to create an interactive ambient piece for a hide-and-seek part of the game where the player has to sneak past a monster. The sounds get more intense and scary the closer the player is to the monster. Apart from the horror elements, the main objective of the music was to capture the mood of a teenage girl who has serious trouble with her family and at school. This is why the music sounds sad (sometimes exaggerated, melodramatic) and in some parts childish.

The sites of Kim and Hieu can be found here: Kim Van / Trung Hieu Nguyen.

Christian Fischer, a fellow student in Trossingen, was very kind to play the cello for some of the recordings for the music.

You can listen to the music here (parts names can be found in the comments on soundcloud):

To create the interactive ambient part, I used a small Unity project which just consists of a single slider (left = moderately scary, right = very scary) to mimic the scary-factor in the game. You can download a build for Windows here and try it yourself:

tl;dr made music for a small video game, listen on sound cloud

After two years of development, I am proud to release De Motu, an interactive music app, made in cooperation with Iris Fegerl, Paul Brenner and Jan Roth. The project was financed by the MFG Baden-Württemberg.

For me, the app was not just a journey through the blood cycle, but also a long journey through the various aspects of app production. The close work with Jan (music) and Paul (graphics) and Iris (concept, testing, everything else) was very challenging and fruitful.

The app’s main menu features four organs – brain, heart, lungs and kidneys – into which the user can zoom in and discover four interactive songs. Both age and sex of the user can be adjusted in the app and will heavily influence the sound. For instance, a high age results in a muffled sound because of age-induced hearing loss. I also like the idea that the user’s sex is a continuous slider, not just “male”, “female”, “inbetween”. This reflects the fact that sexes are not sharply divided into two or three groups, but that a person’s sex is indeed a mere tendency towards being male or female. Extreme settings for both sex and age have extreme effects on the music, too – because in reality, being excessively manly or womanly or being very young or very old are indeed special conditions.

Inside the organs, users can influence different body functions like breathing, blood cleansing and heart rate as well as thinking (in a sense). Inside the brain, it is possible to record your own voice (=thoughts) and spin them on a disk – which feels just like the real brain where thoughts and ideas are constantly re-evaluated and go kind of “back and forth”.

You can check out the game yourself (it’s free!):


Official site:



Idea, concept, project lead + Text: Iris Fegerl
Audio concept + music recordings: Jan Roth
Visual design, animation + interaction design: Paul Brenner
Code, pure data patches + interaction design: Jan Freymann
Mixing: Benjamin Grau
Copy editing: Kemi Fatoba

This game was created using Sparrow 2D engine for iOS  and Libpd.