This helps to avoid flooding of output with the following messages on every MIDI song change:
fluidsynth: error: Unable to open file "/usr/share/sounds/sf2/FluidR3_GS.sf2"
fluidsynth: error: Couldn't load soundfont file
fluidsynth: error: Failed to load SoundFont "/usr/share/sounds/sf2/FluidR3_GS.sf2"
fluidsynth: error: Unable to open file "/usr/share/sounds/sf2/FluidR3_GM.sf2"
fluidsynth: error: Couldn't load soundfont file
fluidsynth: error: Failed to load SoundFont "/usr/share/sounds/sf2/FluidR3_GM.sf2"