So I play (electronic) drums, and my wife plays bass guitar, for 2 separate church bands. In both cases, though, I provide the PA, which is a Yamaha EMX312 powered mixer and a pair of Yamaha C112V speakers. We also typically have 2-3 mic'd vocals plus electric-acoustic guitar and straight electric guitar (both typically DI'd). We generally mix the sound on-stage by doing a couple of sound-checks, setting the levels, and then leaving everything alone for the duration of the performance. However, I know there are times when the mix turns out off because a vocalist moves closer to/further away from the mic, the guitar player fiddles with his gain knob, etc. and it makes me cringe because I can't do anything about because I'm playing, too. So... This is a round-about way of asking: Do you think I can train my (nearly) 12yr old daughter to be our "sound man"? Or are we better off with the set-it-and-forget-it approach?