You may have to type
"java -jar ordrumbox-gui-0.9.1-42-jar-with-dependencies.jar" in the terminal.
You have to do that in the directory you have downloaded the jar file. May be you shoud add a command
"sudo chmod +x ordrumbox-gui-0.9.1-42-jar-with-dependencies.jar"
It's a GPL2 licence, so sources files are available. You have to be a java developer to use it. A maven file (pom.xml) is included in the root directory.
For Windows users, all the files and libraries are included in the setup, the orDrumbox was tested with from Windows XP to WIN 10.
For OSX, the orDrumbox-06.02 was tested on Mac OS X 10.3, other versions should work just upgrade java if needed.
If you experience a bad sound rendering (such as lags or scratch) , you can try to optimize the rendering. So go to the sound settings : settings is the last right button on the main toolbar window and try to activate the 'slow cpu' buttons (see user guide).
Tanks to xucker Japanese documentation of the orDrumbox is available.This documentation is about an very old version of orDrumbox, but some of the documented basic concepts are still accurate.
The orDrumbox desktop drum machine is distributed as freeware.