I'm very much a beginner still, bought an m10 last year and have only done a few recordings with just the internal mics, nothing else. I finally decided to buy some external mics, some used CA-14s and the guy I bought them from also sold me a church audio ST-20A preamp. I'm gonna be honest and it's embarrassing, but I'm not certain how to use everything and set everything up. Do I still need a battery box? Do the mics go line in, into the preamp, and then use a 3.5mm cable line out into the m10? Do I switch the S20 A up (-27) or down (+30) for a very loud show at a small club? Should I leave the volume on the m10 at 3? Any help is appreciated, thank you.