make sample rate changeable, probably

Source/FluidSynthModel.cpp

@@ -12,6 +12,7 @@ FluidSynthModel::FluidSynthModel(SharesParams& p)
           synth(nullptr),
           settings(nullptr),
           currentSoundFontAbsPath(),
+          currentSampleRate(44100),
           initialised(false),
           sfont_id(0),
           channel(0)
@@ -38,6 +39,7 @@ void FluidSynthModel::initialise() {
     fluid_settings_setstr(settings, "synth.verbose", "yes");
 
     synth = new_fluid_synth(settings);
+    fluid_synth_set_sample_rate(synth, currentSampleRate);
 
     if (sharesParams.getSoundFontPath().isNotEmpty()) {
         loadFont(sharesParams.getSoundFontPath());
@@ -203,3 +205,12 @@ void FluidSynthModel::removeListener (FluidSynthModel::Listener* const listener)
 {
     eventListeners.remove(listener);
 }
+
+void FluidSynthModel::setSampleRate(float sampleRate) {
+    currentSampleRate = sampleRate;
+    if (!initialised) {
+        // don't worry; we'll do this in initialise phase regardless
+        return;
+    }
+    fluid_synth_set_sample_rate(synth, sampleRate);
+}

Source/FluidSynthModel.h

@@ -59,6 +59,8 @@ public:
     */
     void removeListener (Listener* listener);
 
+    void setSampleRate(float sampleRate);
+
     const String& getCurrentSoundFontAbsPath();
 
 private:
@@ -70,6 +72,8 @@ private:
 
     String currentSoundFontAbsPath;
 
+    float currentSampleRate;
+
     const fluid_preset_t getFirstPreset();
     void selectFirstPreset();
     unique_ptr<BankAndPreset> getFirstBankAndPreset();

Source/PluginProcessor.cpp

@@ -111,6 +111,7 @@ void JuicySFAudioProcessor::prepareToPlay (double sampleRate, int /*samplesPerBl
     // initialisation that you need..
     synth.setCurrentPlaybackSampleRate (sampleRate);
     keyboardState.reset();
+    fluidSynthModel.setSampleRate(static_cast<float>(sampleRate));
 
     reset();
 }