Added code

Source/NoiseVoice.h

@@ -0,0 +1,28 @@
+/*
+  ==============================================================================
+
+    NoiseVoice.h
+    Created: 11 Nov 2019 9:37:21pm
+    Author:  除村 武志
+
+  ==============================================================================
+*/
+
+#pragma once
+#include "TonalVoice.h"
+
+struct NoiseVoice : public TonalVoice {
+    
+    NoiseVoice(SettingRefs *sRefs);
+    double cycleLength = MathConstants<float>::pi / 8.0;
+
+    // Noise states
+    float currentVoltage = -0.5;
+    double nextAngle = cycleLength;
+    double previousAngle = 0;
+    unsigned int rgstr = 0b111111111111111;
+
+    void startNote (int midiNoteNumber, float velocity,
+                    SynthesiserSound*, int currentPitchWheelPosition) override;
+    float voltageForAngle (double angle) override;
+};