PAL Script - Play a Random Track from a Specified Category at the Bottom of the Hour

This script can be modified by changing the frequency and the category to play one random  track from a specified category at the bottom of the hour, e.g. 8.30, 9.30, 10.30 etc:

{ PAL Script: Play Promos every 30 mins}

PAL.loop := true;
PAL.WaitForTime ('+00:30:00');  // adjust the time interval here
Cat['Promos (All)'].QueueTop(smRandom, EnforceRules); //select the category here