If one has got Subversion installed, the latest sources can easily be obtained by running the following three commands:

svn --username anonsvn --password anonsvn \
      checkout svn://svn.turbocat.net/i4b/midistudio

svn --username anonsvn --password anonsvn \
      checkout svn://svn.turbocat.net/i4b/libumidi20

svn --username anonsvn --password anonsvn \
      checkout svn://svn.turbocat.net/i4b/playmidi