Comment 16 for bug 196135

> At the moment gstreamer-midi doesn't support sf2 files. I'm unsure
> whether there is work going on to enable that

According to https://bugs.launchpad.net/ubuntu/+source/timidity/+bug/111555 gstreamer comes packaged with wildmidi instead of timidity.
wildmidi is still actively developed but does not currently support sf2 files (see http://wildmidi.sourceforge.net/ - Soundfont 2 support is scheduled for 0.3.0), so using fluid as default makes little sense with this setup. Alternatively someone would have to package timidity support for gstreamer, but that didn't work out so far... (although it might be worthwhile, because currently timidity seems to offer better quality)