The XMF format is well documented at the midi.org specifications, it is still supported in the Android OS, and can be parsed and played back by the Sonivox library. There is one sample in the Sonivox unit tests resources named 'testmxmf.mxmf'. MXMF is the mobile version of XMF.

The "Nokia Audio Suite 2" had another sample 'Dancehall.mxmf', but having only two files is a very limited test suite. Help wanted!

Anyway, we should include support for XMF in the build system, the unit tests and the sample program.