#include <Tone.h>

int notes[] = { NOTE_A3,
                NOTE_B3,
                NOTE_C4,
                NOTE_D4,
                NOTE_E4,
                NOTE_F4,
                NOTE_G4 };

// You can declare the tones as an array
Tone notePlayer[2];

void setup(void)
{
  Serial.begin(9600);
  notePlayer[0].begin(11);
  notePlayer[1].begin(12);
}

void loop(void)
{
  char c;

  if(Serial.available())
  {
    c = Serial.read();
    
    switch(c)
    {
      case 'a'...'g':
        notePlayer[0].play(notes[c - 'a']);
        Serial.println(notes[c - 'a']);
        break;
      case 's':
        notePlayer[0].stop();
        break;

      case 'A'...'G':
        notePlayer[1].play(notes[c - 'A']);
        Serial.println(notes[c - 'A']);
        break;
      case 'S':
        notePlayer[1].stop();
        break;

      default:
        notePlayer[1].stop();
        notePlayer[0].play(NOTE_B2);
        delay(300);
        notePlayer[0].stop();
        delay(100);
        notePlayer[1].play(NOTE_B2);
        delay(300);
        notePlayer[1].stop();
        break;
    }
  }