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Eisenkraut is a standalone, cross-platform audio file editor using the SuperCollider 3 server application.

Eisenkraut is (C)opyright 2004–2019 by Hanns Holger Rutz. All rights reserved. It is released under the GNU General Public License.

To contact the author, send an email to contact at For project status, API and current version visit

Please consider supporting this project through Liberapay (see badge above) – thank you!


A binary version of Eisenkraut for all platforms is provided through and GitHub Releases. You need a Java runtime for Eisenkraut. Type java -version in a terminal to find out whether you have Java installed. Otherwise look at for ways of installing OpenJDK on your operating system. Furthermore, you need SuperCollider, the installation of which is described in the next section.

setting up and running


installing supercollider

Eisenkraut uses the SuperCollider server as the audio playback engine. You need to install a recent SuperCollider 3 version to run this software. The recommended version of SuperCollider is 3.10.x but things back to 3.7.x should work fine.

starting eisenkraut

To launch Eisenkraut, you use the eisenkraut shell script (Linux and OS X) or the eisenkraut.bat script (Windows). When using the Debian package, you have eisenkraut on your path and can find a desktop entry to add to your favourites.

After launching Eisenkraut for the first time, make sure that the "SuperCollider Server (scsynth)" field in the audio preferences is pointing to the valid scsynth or scsynth.exe (on Windows) file! On OS X, newer SuperCollider versions "hide" the scsynth command line tool inside the bundle. So the correct path will be something like /Applications/SuperCollider/

Also note that, by default, the audio server is not automatically booted, so you need to press the "Boot" button in the main window to launch the server and be able to actually hear the sound file when playing it back. There is a preferences switch to enable automatic booting.

building from source

Eisenkraut can be build from source with sbt.

  • to compile: sbt compile
  • to package: sbt package
  • to run: sbt run
  • to make a standalone jar: sbt assembly

The release bundles are produced with tasks universal:packageBin and debian:packageBin.

Note: Some jerk (really) descided to change the API of javax.swing.tree.TreeNode in a non-backwards compatible fashion. The project currently requries JDK 8 to compile, as JDK 11 contains this breakage. We may decide in the future to move on to JDK 11 or 12.

source code distribution

Eisenkraut's GPL'ed source code is made available through

  • As a SuperCollider client it uses the JCollider library, which is also licensed under the GNU Lesser General Public License (LGPL). The compiled library is included, for source code and details visit
  • For OSC communication, the NetUtil library is used, which is licensed under the GNU Lesser General Public License (LGPL), for source code and details visit
  • It uses the ScissLib library which is licensed under the GNU Lesser General Public License (LGPL), source code provided through


Please see the file for details.


Please refer to the help/index.html file for a list of manual topics.

A short screencast is available on Vimeo.


A lot. Here are some suggestions:

  • Still need to integrate FScape (more a job about FScape than about Eisenkraut)
  • Finding a way to edit with simultaneous video display (might be a separate app synchronized through some kind of OSC transport)
  • Optionally saving meta-information with the sound files (e.g. a separate XML file), like panorama settings, window bounds etc.
  • Finishing sonogram functionality (needs decimation and must be editable)
  • Improving SuperCollider interface and classes
  • etc. etc.

In the long-term, Eisenkraut will most likely be integrated with Mellite.

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