closes #3

Added freeze pitch and volume controls

Source/shifter_voice.h

@@ -32,6 +32,7 @@ public:
 	void SetAdsrTimes(float attack, float decay, float release);
 	float GetPanning(int channel) const;
 	int GetMidiNote() const { return current_midi; }
+	void SetPitchAdjust(float);
 	bool onoff_;
 
 	float panning;
@@ -46,5 +47,6 @@ private:
 	float current_period_;
 	float current_amplitude;
 	float period_counter;
+	float pitch_adjust = 0.0f;
 	
 };