I got impatient so I queried the source code and it looks like there is a fluidsynth plugin. https://github.com/LMMS/lmms/search?p=1&q=sf2 I also looked at the dependencies and I see libfluidsynth2 (>= 2.0.5). I also see a libfluidsynth3 that I don't have installed, but it is a dependency of the...