I'm high school with relatively outdated equipment. We currently have a 48/96 dimmer rack. It's a CD80 strand century. It's from the early eighties. Our dilemma seems to be that many of our dimmer ghost, pop up or do other random things. We've had a repair guy come in twice recently and he looked at all of our dimmers and said they were fine. However, the very next night, they were ghosting again. I've dusted in and around the dimmers, switched out the location in the rack, just about everything. The man from Operashop saw nothing wrong with them, yet they still ghost. Any solutions I haven't thought of yet? Also, another random curiosity that's been bothering me for a while. Is it acceptable to mix gel colors to get the right look? I assume it's alright, but there's probably some random reason not to. Thanks.