ETC Sensor™ SP6 packs don't like me. I've never shown them anything except respect, but somehow we have issues together. I get along fine with SR24 and SR48 install and road racks and have never had a disagreement with an MPE. Anyhow, today during class I had a problem and was lazy and called ETC Service. Turns out the CEM in my 12-pack thought it was a 48 rack. Most likely someone in the shop thought one could just swap CEMs. In less than 10 minutes, Tracy had solved my problem, and talked me through the process of allowing the CEM to discover into what kind of rack it's inserted. I could have looked it up in the PDFs myself, or posted a message here, but I wnted an immediate answer, as lunch was almost over. Here is the rig I used: My goal for the class today was just to get people to know what all the parts of a lighting system are called, and a little about how they plug together and why. The picture above shows (top, L to R) S4-PAR VNSP, VNSP, NSP, MFL, WFL, XWFL. Below are 410, 414, 419, 426, 436, 450, and VL2500Spot. On the floor is a VL24042, a 4552 bar, and my LED ParCan. I think it was a pretty good training rig, to show people the differences and similarities and a little about photometrics. Feel free to point out all the flaws in the picture.