Agreed on running Pi's I ran 3 for my first year. One as my master and two as virtual matrix's running 40'' monitors. They all kept n sync and I had no problems with them all season. They will run video off the hdmi and keep in sync just have a video file with the same name just different extension as your sequence on the master and it automatically plays. In virtual matrix mode you can run all of the effects xlights does or text and then output them via hdmi on the remote pi to the projector.