You should configure sound from the preferences window, and try to use
an external midi player. Or try to recompile the program and check for
error messages to see why the module is not built."
This error message is presented at the program start, as well as when
trying to save modified "audio setup" preferences.
The error is related to . Daniel Bermon's comment to the bug
discussion  shows a workaround for the issue that worked for me, too.
The latest bug comments suggest that an updated solfege version was to
be included into Ubuntu Hardy, however, in my installation the package
version is still "3.9.3-4." It may be a good idea for the developers to
- either include a newer solfege version
- or alter the default settings of the installed package.
The latter option appears to be the less time-consuming option (for my
inexperienced mind): In the file /usr/share/solfege/default.config,
section [sound], replace "type=sequencer-device" with
Hope, my few cents are of help. Best regards,