Hi,
if you are runnning a Glec LED Wall with Pandoras Box you may notice that black is not black on the LED. Normally the LEDs will show a dark blue or magenta instead of beeing of.
There is a little trick to get this in real black. Set the following Video FX to all Layers playing on Glec:
Video FX: LED
FX 1: 34
FX 2: 255
FX3: 0
I only tested this in Glec Phantom III SMD, but I guess it will be the same on other Glec Systems and on the Martin LEDs as well.
Thanks to Fletch @ Fournell Showtechnik for this hint.....