Basic monophonic

Source/BaseVoice.cpp

@@ -218,6 +218,13 @@ void BaseVoice::renderNextBlock (AudioSampleBuffer& outputBuffer, int startSampl
     }
 }
 
+void BaseVoice::changeNote (int midiNoteNumber, float velocity) {
+    noteNumber = midiNoteNumber;
+
+    ampByVelocityAndGain = * (settingRefs->gain) * velocity; // velocity value range is 0.0f-1.0f
+}
+
+
 void BaseVoice::calculateAngleDelta()
 {
     auto cyclesPerSecond = MidiMessage::getMidiNoteInHertz (noteNumber);

Source/BaseVoice.h

@@ -24,6 +24,8 @@ struct BaseVoice : public SynthesiserVoice
     void pitchWheelMoved (int) override      {}
     void controllerMoved (int, int) override {}
     void renderNextBlock (AudioSampleBuffer& outputBuffer, int startSample, int numSamples) override;
+    
+    void changeNote (int midiNoteNumber, float velocity);
 
     virtual float voltageForAngle (double angle) = 0;
     virtual void onFrameAdvanced() {};

Source/CustomSynth.cpp

@@ -9,13 +9,36 @@
 */
 
 #include "CustomSynth.h"
+#include "BaseVoice.h"
+#include "PluginProcessor.h"
 
 CustomSynth::CustomSynth(Magical8bitPlug2AudioProcessor& p) : processor(p) {}
 
 void CustomSynth::noteOn(int midiChannel, int midiNoteNumber, float velocity) {
-    Synthesiser::noteOn(midiChannel, midiNoteNumber, velocity);
+    // Poly
+    if (!processor.settingRefs.isMonophonic()) {
+        Synthesiser::noteOn(midiChannel, midiNoteNumber, velocity);
+        return;
+    }
+    
+    // Mono
+    auto voice = voices.getFirst();
+    
+    if (voice == nullptr) {
+        return;
+    }
+    if (voice->isKeyDown()) {
+        ((BaseVoice*)voice)->changeNote(midiNoteNumber, velocity);
+    } else {
+        Synthesiser::noteOn(midiChannel, midiNoteNumber, velocity);
+    }
 }
 
 void CustomSynth::noteOff(int midiChannel, int midiNoteNumber, float velocity, bool allowTailOff) {
     Synthesiser::noteOff(midiChannel, midiNoteNumber, velocity, allowTailOff);
 }
+
+void CustomSynth::allNotesOff (const int midiChannel, const bool allowTailOff) {
+    Synthesiser::allNotesOff(midiChannel, allowTailOff);
+}
+

Source/CustomSynth.h

@@ -19,6 +19,7 @@ public:
     
     void noteOn(int midiChannel, int midiNoteNumber, float velocity) override;
     void noteOff(int midiChannel, int midiNoteNumber, float velocity, bool allowTailOff) override;
+    void allNotesOff (const int midiChannel, const bool allowTailOff) override;
     
 private:
     Magical8bitPlug2AudioProcessor& processor;