How to make piezo disc louder

Other Hardware General Electronics
80 
void setup()
{

}

void loop()
{
  for (unsigned int x = 200; x <= 4000; x += 100) 
  {
    tone(8, x);
    delay(200);
  }

  for (unsigned int x = 4000; x >= 200; x -= 100) 
  {
    tone(8, x);
    delay(200);
  }

} //END of loop()
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