private void Timer_Banner_Tick(object sender, EventArgs e)
 {
     if (countDownTimer3 != 0)
     {
         countDownTimer3--;
     }
     else
     {
         if (banner == "Round " + round)  // solo se reproduce el sonido si es un cambio de round
         {
             Banner.Hide();
         }
         countDownTimer3 = 3;
         Timer_Banner.Stop();
         StartAgan();
     }
 }