They're a plauge spreading like wildfire in Sydney at the moment. For those of you who haven't come across one:- the venue installs a little microphone that measures how loud the band is. It's connected to a box with three flashing lights. The first light is green, the second light is blue and comes on as you get louder. The final light is red and if it stays illuminated for 4 seconds, the electricity on stage gets cut. Word of advice, if your ever caught in this situation, remember that the power will come back on in 20 seconds or so. You've got 20 seconds to turn your amp off and avoid an almighty THUMP through your speakers when the power comes back on. The venue can adjust the Decibel level at which the red light comes on. But most venue managers are simpelton beer-pigs don't understand the mechanics of sound pressure levels. The seem to want to negotiate in steps of 5dB, without realising that a)100dB is a hell of a lot quiter than 105dB, and b)they'd be better off negotiating in units of 3dB at a time. I'm curious, how common are these ghastly devices in your neck of the woods? And do they have the Db threshold set to a realistic level for a full band?