Hi,
[..]
There does
not seem to be an update to the qsynth package (at least
in the scope of Linux Mint 14).
Hopefully, other people have noticed this problem !
Have not encountered it. Possible that the qsynth config file got messed
up? I have no idea where it's kept.
That would be ~/.config/rncbc.org/Qsynth.conf. Perhaps try removing/renaming
that file, thereby enforcing QSynth to write it out anew.
Also, did you check whether the original .sf2 file might have been damaged
somehow (like, getting corrupted during a hard crash?) Try re-downloading it
and perhaps comparing checksums with "md5sum".
Greetings,
Frank