pitch tracking working on some basic level

Source/Yin.cpp

@@ -1,12 +1,13 @@
 #include "Yin.h"
 #include <stdlib.h>
+#include <stdio.h>
 //#include "WProgram.h"
 
 void Yin::initialize(float yinSampleRate,int yinBufferSize){
 	bufferSize = yinBufferSize;
 	sampleRate = yinSampleRate;
 	halfBufferSize = bufferSize / 2;
-	threshold = 0.15;
+	threshold = 0.01;
 	probability = 0.0;
 	//initialize array and set it to zero
 	yinBuffer = (float *) malloc(sizeof(float)* halfBufferSize);
@@ -137,6 +138,7 @@ int Yin::absoluteThreshold(){
 			break;
 		}
 	}
+
 	// if no pitch found, tau => -1
 	if (tau == halfBufferSize || yinBuffer[tau] >= threshold) {
 		tau = -1;