Using the suggestion to Vangellis by DJSoft I created a file with intro jingles in it, a file with 15 adverts in it and a third file with station general jingles. Using Playlist Generator Pro I have set up 1 intro jingle at random, 3 adverts in order and one jingle random and saved the preset as "Ad Block". My question is that the playout system seems to be choosing the same 3 ads from the list of 15. I thought it would choose 1, 2, 3 then 4, 5, 6 etc. Can anyone shed light on what I am doing wrong.