Looking at the back.. where is my X-Y invert switches??? Kinda useless without these for multiple stage units. Another solution to Liteglow's method #1 above is just have a backup unit in stock at all times. At the price of these units, this is more than possible to save your a$$. I have backup lasers to all of my systems, these things fail regardless of who makes it and how good they are. You are not going to be replacing diodes or modules in the middle of the concert anyways, fix it properly after the show in your shop.