midi notes avaiable on ui

Source/shifter_voice.h

@@ -32,12 +32,14 @@ public:
 	void SetAdsrTimes(float attack, float decay, float release);
 	float GetPanning(int channel) const;
 	int GetMidiNote() const { return current_midi; }
+	bool onoff_;
 
 private:
 	Port portamento_;
 	Adsr amplitude_envelope_;
-	bool onoff_;
+	
 	bool overflow_;
+	float sample_rate_;
 	int current_midi;
 	float current_period_;
 	float current_amplitude;