NINJAM is open source (GPL) software to allow people to make real music together via the Internet. Every participant can hear every other participant. Each user can also tweak their personal mix to their liking. NINJAM is cross-platform, with clients available for Mac OS X, Linux, and Windows. REAPER (our digital audio workstation software for Windows and OS X) also includes NINJAM support (ReaNINJAM plug-in).
After the VM is created the server will be running at the IP specified on port 2049 (default).
If you wish to edit the default config, it can be found at
/etc/ninjam.cfg. You can find a reference for each of the options here.