Hi All, With LSP randomly deciding not to output, I wrote a simple E1.31 debug tool that listens to the multicast stream. Output is displayed visually, as boxes, shaded as per that channels DMX intensity. The 2nd row is channels grouped as per RGB logic, and coloured accordingly. Command line arguement can be the DMX universe number to force defaulting to a particular universe. Note that (at this stage at least), only one universe can be monitied at a time. Starting a 2nd copy to monitor another universe will fail. Also mouse-over the boxes and the channel number will be shown on the tooltip. Enjoy!