Added code

Source/PulseVoice.cpp

@@ -0,0 +1,62 @@
+/*
+  ==============================================================================
+
+    PulseVoice.cpp
+    Created: 11 Nov 2019 9:36:51pm
+    Author:  除村 武志
+
+  ==============================================================================
+*/
+
+#include "PulseVoice.h"
+
+//---------------------------------------------
+//
+// Pulse Voice
+//
+//---------------------------------------------
+PulseVoice::PulseVoice (SettingRefs* sRefs) : TonalVoice (sRefs) {}
+
+void PulseVoice::startNote (int midiNoteNumber, float velocity, SynthesiserSound*, int currentPitchBendPosition)
+{
+    TonalVoice::startNote (midiNoteNumber, velocity, 0, currentPitchBendPosition);
+
+    currentDutySequenceFrame = 0;
+    currentDuty = (PulseDuty) ((int) (*settingRefs->duty));
+}
+
+float PulseVoice::voltageForAngle (double angle)
+{
+    float rate = 1.0;
+
+    switch (currentDuty)
+    {
+        case kPulseDuty125:
+            rate = 0.25;
+            break;
+
+        case kPulseDuty250:
+            rate = 0.50;
+            break;
+
+        case kPulseDuty500:
+            rate = 1.00;
+            break;
+
+        default:
+            break;
+    }
+
+    return angle < rate * MathConstants<float>::pi ? -1.0 : 1.0;
+}
+
+void PulseVoice::advanceControlFrame()
+{
+    TonalVoice::advanceControlFrame();
+
+    if (settingRefs->isDutySequenceEnabled())
+    {
+        currentDutySequenceFrame = settingRefs->dutySequence.nextIndexOf (currentDutySequenceFrame);
+        currentDuty = (PulseDuty)settingRefs->dutySequence.valueAt (currentDutySequenceFrame);
+    }
+}