Hello everyone! I know that this is more of a pro audio question, but I've been here at AK for a bit, and I know you guys (and ladies...) are always helpful. In all honesty, I should know this already - I spent a year at the Accessories Counter at Guitar Center. ( aged me 5 years...) Never spent much time in the pro audio department. Anyway... I picked up these two JBL mixers recently. I would like very much to be able to test them before I pass them on to my next happy customer. My questions: 1. Both units have XLR outputs. I have an XLR to 1/4" plug cord. Can I plug this into the "instrument in" on a guitar amp? Do I need a PA amp? 2. Both units have an 1/4" "aux input" - what level signal is required? I sent it a line-level signal and had to max out the master gain to get the VU to start moving. 3. Most importantly, is it Cool? That's really all I care about. Thanks in advance for reading my ramblings. Any input at all would be greatly appreciated.