Did you have any luck getting it to work? If you are compiling from source please can you try this version.
The latest code for now can be downloaded using this link
https://github.com/captnfab/PianoBooster/archive/develop.zipTo get fluidsynth to work just type the following on the command line
fluidsynth -g 1.0 -a alsa -o midi.alsa_seq.id=fs2 /usr/share/sounds/sf2/FluidR3_GM.sf2
or for timidiy just type this on the command line.
timidity -iA -B2,8 -Os -EFreverb=0
Once you have done once of those then just go into PB in the MIDI setup and the fluidsynth or timidity device should show up,