void setup() {
  // put your setup code here, to run once:
// name Arduino board pins used by the circuit
const int notePin = A0;
const int togglePin = 3;
const int buzzerPin = 8;

void loop() {
  // put your main code here, to run repeatedly:
// declare variables
int rate = 500;
int frequency= 1000000 / (rate * 2);

// name Arduino board pins used by the circuit
const int notePin = A0;
const int togglePin = 3;
const int buzzerPin = 8;

// declare variables
int keyVal = 0;
ladder

// declare variables
int rate = 500;
int frequency=1000000 / (rate * 2);

// name Arduino board pins used by the circuit
const int notePin = A0;
const int togglePin = 3;
const int buzzerPin = 8;

// declare variables
int keyVal = 0;
ladder

// declare variables
int keyVal = 0;
ladder
int key = 0;

// declare variables
int keyVal = 0;
ladder
int key = 0;
int switchState = 0:

// declare variables
int keyVal= 0;
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int key = 0;
int switchState = 0;
int note = 0;
int oldNote = 0;

// stores the analog value from the resistor

// stores the button that is pressed
// stores the state of the toggle button
// stores which note should be played
// stores the previous note that was played

// declare variables
int keyVal = 0;
ladder
int key = 0;
int switchState = 0;
int note = 0;
int oldNote = 0;

// an array of notes with frequencies of middle C, D, E, F, G, A, B, and high C
int notes[]={262, 294, 330, 349, 392, 440, 494, 523};

// stores the analog value from the resistor
// stores the analog value from the resistor
}