I'm going to be doing some recording using the balanced XLR line out of my amp going to a mixer and then a 4-track. What input on the mixer should I connect the amps balanced XLR to? I read in the Bass Player book that you're supposed to plug it into one of the mic preamps on the mixer, not the plain old balanced line ins . Is this true? False? Also, my mixer has one headphone jack but I need to hook up a second set of headphones. Can I just plug the phones into the "control room out" jacks (left and right, so I'll just use a Y cable to connect to the headphones?