Disable fluidsynth audio backends if possible

Closes LMMS#649
Partially reverts LMMS#3446

.travis/osx..install.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-PACKAGES="cmake pkgconfig fftw libogg libvorbis lame libsndfile libsamplerate jack sdl libgig libsoundio stk portaudio node fltk"
+PACKAGES="cmake pkgconfig fftw libogg libvorbis lame libsndfile libsamplerate jack sdl libgig libsoundio stk fluid-synth portaudio node fltk"
 
 if [ $QT5 ]; then
 	PACKAGES="$PACKAGES qt5"
@@ -10,10 +10,4 @@ fi
 
 brew install $PACKAGES ccache
 
-# Recompile fluid-synth without CoreAudio per issues #649
-# Changes to fluid-synth.rb must be pushed to URL prior to use
-url=$(git remote get-url origin)
-branch=$(git symbolic-ref --short HEAD)
-brew install --build-from-source $url/raw/$branch/cmake/apple/fluid-synth.rb
-
 sudo npm install -g appdmg

plugins/sf2_player/sf2_player.cpp

@@ -113,6 +113,12 @@ sf2Instrument::sf2Instrument( InstrumentTrack * _instrument_track ) :
 		m_notesRunning[i] = 0;
 	}
 
+
+#if FLUIDSYNTH_VERSION_MAJOR >= 1 && FLUIDSYNTH_VERSION_MINOR >= 1 && FLUIDSYNTH_VERSION_MICRO >= 9
+	// Deactivate all audio drivers in fluidsynth
+	const char *none[] = { NULL };
+	fluid_audio_driver_register( none );
+#endif
 	m_settings = new_fluid_settings();
 
 	//fluid_settings_setint( m_settings, (char *) "audio.period-size", engine::mixer()->framesPerPeriod() );