Arduino Capacitive Touch Piano Debugging

/*
  Capacitive-Touch Arduino Keyboard Piano Debugging

  Displays capacitive touch sensor readings in the Serial Monitor.

  Created  18 May 2013
  Modified 26 June 2013
  by Tyler Crumpton and Nicholas Jones

  This code is released to the public domain. For information about the circuit,
  visit the Instructable tutorial at http://www.instructables.com/id/Capacitive-Touch-Arduino-Keyboard-Piano/
*/

#include <CapacitiveSensor.h>
#include "pitches.h"

#define COMMON_PIN      2    // The common 'send' pin for all keys
#define BUZZER_PIN      A4   // The output pin for the piezo buzzer
#define NUM_OF_SAMPLES  10   // Higher number whens more delay but more consistent readings
#define CAP_THRESHOLD   150  // Capactive reading that triggers a note (adjust to fit your needs)
#define NUM_OF_KEYS     8    // Number of keys that are on the keyboard

// This macro creates a capacitance "key" sensor object for each key on the piano keyboard:
#define CS(Y) CapacitiveSensor(2, Y)

// Each key corresponds to a note, which are defined here. Uncomment the scale that you want to use:
int notes[]={NOTE_C4,NOTE_D4,NOTE_E4,NOTE_F4,NOTE_G4,NOTE_A4,NOTE_B4,NOTE_C5}; // C-Major scale
//int notes[]={NOTE_A4,NOTE_B4,NOTE_C5,NOTE_D5,NOTE_E5,NOTE_F5,NOTE_G5,NOTE_A5}; // A-Minor scale
//int notes[]={NOTE_C4,NOTE_DS4,NOTE_F4,NOTE_FS4,NOTE_G4,NOTE_AS4,NOTE_C5,NOTE_DS5}; // C Blues scale

// Defines the pins that the keys are connected to:
CapacitiveSensor keys[] = {CS(3), CS(4), CS(5), CS(6), CS(7), CS(8), CS(9), CS(10)};

void setup() {
  // Start up the Serial interface:
  Serial.begin(9600);
  // Turn off autocalibrate on all channels:
  for(int i=0; i<8; ++i) {
    keys[i].set_CS_AutocaL_Millis(0xFFFFFFFF);
  }
  // Set the buzzer as an output:
  pinMode(BUZZER_PIN, OUTPUT);
}

void loop() {
  // Loop through each key and print the sensor values:
  for (int i = 0; i < 8; ++i) {
    Serial.print(i);
    Serial.print(":");
    Serial.print(keys[i].capacitiveSensor(NUM_OF_SAMPLES));
    Serial.print("  ");
  }
  // Add a newline after all of the values have been printed:
  Serial.println(" ");
}