The clocks are a tool that will set up the random selection of songs and jingles that will be streamed on your radio.
Go to the 'Clocks & playlist' tab, and create a new clock.
Then you will have to drag'n'drop your music boxes onto the column in the middle. You will see a 'camembert' chart adapting proportions of your various music boxes. The clocks determine the proportion and also the sequence of music boxes that will be called by the planing generator later on.