some explain to the sound music??

[NILSS0N81]

//Sound

aTime = millis() - iTime;
timeCalcVar = (millis() - iTime) % 1000;
if (timeCalcVar >= 245 && timeCalcVar <= 255 && minutos - aTime / 60000 < 2 && soundEnable)tone(tonepin, activeTone, largoTono);
if (timeCalcVar >= 495 && timeCalcVar <= 510 && minutos - aTime / 60000 < 4 && soundEnable)tone(tonepin, activeTone, largoTono);
if (timeCalcVar >= 745 && timeCalcVar <= 760 && minutos - aTime / 60000 < 2 && soundEnable)tone(tonepin, activeTone, largoTono);
if ( minutos - aTime / 60000 == 0 && 59 - ((aTime / 1000) % 60) < 10)largoTono = 300;

it starts to play some melody after a while... if i only whant 1 beep per second ... what to change??