remove some unused methods on FluidSynthModel. make FilePicker update displayed text upon load. read and write into XML just the bits that we need, and take advantage of attribute names' being indexed. take more care in setting sfont_id.

Source/FluidSynthModel.h

@@ -31,12 +31,12 @@ public:
     shared_ptr<fluid_synth_t> getSynth();
     void initialise();
 
-    BanksToPresets getBanks();
+//    BanksToPresets getBanks();
 
-    void changePreset(int bank, int preset);
+//    void changePreset(int bank, int preset);
     int getChannel();
 
-    void onFileNameChanged(const String &absPath, int bank, int preset);
+//    void onFileNameChanged(const String &absPath, int bank, int preset);
     void setControllerValue(int controller, int value);
 
     //==============================================================================
@@ -68,7 +68,7 @@ public:
 
     void setSampleRate(float sampleRate);
 
-    const String& getCurrentSoundFontAbsPath();
+//    const String& getCurrentSoundFontAbsPath();
     
     virtual void parameterChanged (const String& parameterID, float newValue) override;
     
@@ -123,7 +123,7 @@ private:
     shared_ptr<fluid_synth_t> synth;
     // unique_ptr<fluid_midi_driver_t, decltype(&delete_fluid_midi_driver)> midiDriver;
 
-    String currentSoundFontAbsPath;
+//    String currentSoundFontAbsPath;
 
     float currentSampleRate;
 
@@ -133,12 +133,12 @@ private:
 
     void unloadAndLoadFont(const String &absPath);
     void loadFont(const String &absPath);
-    bool shouldLoadFont(const String &absPath);
+//    bool shouldLoadFont(const String &absPath);
 
     void changePresetImpl(int bank, int preset);
 
-    bool initialised;
-    unsigned int sfont_id;
+//    bool initialised;
+    int sfont_id;
     unsigned int channel;
 
 //    fluid_mod_t* mod;