Hi, I just closed our first weekend of our spring musical and I had the most awful experience with our microphones Friday. We are currently using 22 microphones in our production: 9 AT 1400 series (pre-set single frequency) 5 AT 3000 series (can be set to dozens of different frequencies) 8 Telex FMR-500 series (similar to teh AT 3000's with a scanning feature to find the best frequency). For the life of me I cannot stop microphones from interfering with each other. I've changed frequencies on the microphones that I can change, I've researched area television stations to be sure that I haven't set a microphone to their frequency per the instructions, I've had sound checks where I have multiple microphones on at all times to make sure that I create a good gain structure... all to no avail. I have microphones cutting out, I have mics not amplifying the actor and yet feeding back when I try to volume it up, I have mics making a zinging noise while the people are speaking, they constantly feed back, several times through the productions their receivers showed no signal coming in only to have it abruptly come in and then go out... it was maddening. So... what do you professionals out there do to get a good sound mix with multiple microphones? What advice can you give to a theater person who's ready to just toss it all in and go camping instead? I'm frustrated! I've worked for 16 weeks on this show at an average of 85 hours a week only to have my students' hard work ruined by these frigging microphones. I'm to the point where I'm going to try to hire a professional theater person (except I simply don't have the budget for one... small school and all). AHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHHH!