I've been playing in a church band for a couple of years now. We've been using a Peavey KB3 as our sole amplifier for 1 mic, electrical guitar, electric bass, and electronic drums. But that maxes out the available input channels and I'd like to be able to add 1 or 2 more mics and maybe 1 more guitar. So I'm looking for a new amp. So far, I've been looking at PA systems (eg Yamaha Stagepass) because they come with multiple mic inputs, and are modular, so they easier to schlep around (the KB weighs a frickin' ton). However, most of the PAs I've looked at do not have instrument inputs, just mics and line-in. My question comes down to this.... How do I best get my instruments into the PA? Do I need an additional dongle that plugs into the line-in on the PA or can I just adapt the 1/4 jack to XLR and go straight into the mic inputs? Why don't PAs typically have instrument inputs, anyway? Lastly, will the sound be adequate from the PA without dedicated guitar/bass amps?