closes #2

Add dynamic toggle options. Add toggle for turning on and off the autotune

Source/Shifter.h

@@ -157,6 +157,7 @@ public:
 	float getInputPitch() const { return sample_rate_ / in_period; }
 	float getOutputPitch() const { return sample_rate_ / out_period; }
     void SetHarmonyMix(float mix);
+	void SetAutoTuneEnable(bool enable) { enable_autotune = enable; }
 
     float out_midi = 40;
     ShifterVoice voices[MAX_VOICES];
@@ -219,6 +220,7 @@ private:
     float cos_lookup[8192];
     float sample_rate_;
     int blocksize;
+	bool enable_autotune = false;
     MidiPitchSmoother out_midi_smoother;
 };
 #endif