Arduino Tone Generator

//Arduino Tone Generator
void setup()
{
for (int i=2;i<10;i++)
{
pinMode(i, INPUT_PULLUP);
}
pinMode(11,OUTPUT);
}

void loop()
{
if (digitalRead(2)==LOW)
{
analogWrite(11,25);
delay(100);
analogWrite(11,0);
 }
if (digitalRead(3)==LOW)
      {
analogWrite(11,50);
delay(100);
analogWrite(11,0);
      }
if (digitalRead(4)==LOW)
     {
analogWrite(11,75);
delay(100);
analogWrite(11,0);
     }
if (digitalRead(5)==LOW)
    {
analogWrite(11,100);
delay(100);
analogWrite(11,0);
      }
if (digitalRead(6)==LOW)
     {
analogWrite(11,125);
delay(100);
analogWrite(11,0);
     }
if (digitalRead(7)==LOW)
    {
analogWrite(11,150);
delay(100);
analogWrite(11,0);
    }
if (digitalRead(8)==LOW)
  {
analogWrite(11,175);
delay(100);
analogWrite(11,0);
   }
if (digitalRead(9)==LOW)
  {
analogWrite(11,200);
delay(100);
analogWrite(11,0);
  }
}