some app controls, format preserve, start of autotune speed

Source/Shifter.h

@@ -82,6 +82,7 @@ public:
     void AddMidiNote(int note);
     void RemoveMidiNote(int note);
 	void SetFormantPreserve(float val) { formant_preserve = val; }
+    void SetAutoTuneSpeed(float val) { out_period_filter_amount = 1 - val; }
 
     int out_midi[MAX_VOICES + 1] = { -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1 };
 
@@ -129,6 +130,9 @@ private:
     float out_buffer[2][BUFFER_SIZE];
     int out_playhead = 0;
     int in_playhead = 0;
+	int last_autotune_midi = -1;
+
+	float out_period_filter_amount = 0.7f; // You can expose this as a parameter
     
     float out_periods[MAX_VOICES + 1] = { 0,0,0,0,0,0,0,0,0,0,0,0 }; //C3
     float out_panning[MAX_VOICES + 1] = { 0,0,0,0,0,0,0,0,0,0,0,.5 }; //C3