in the path that leads to INBUFF, XLR pin 2 goes to both 4.7uF capacitors and op-amp inputs so is it not a balanced input that would use XLR pin 3 as well?

and quick rundown on the +4dBu vs -10dBu switch, does it gain up when -10dBu is selected and keep neutral gain when +4dBu is selected?