The other night a had a buddy over for a couple of beers. He likes to play harmonica and we ended up playing a little blues. He asked me how many in's do you have on your amp? He was figuring that he should buy a cheap mic one of these days so that he can plug in to my amp when we jam. Would that work? Please excuse my ignorance. I had thought that you needed a P.A. for microphones, but then I realized I don't really know exactly what a P.A. is. If it makes a difference, this is an 80 watt Peavy TKO 115. As always, mods please move it if I'm in the wrong forum.