1. Get an amplified mic and and follow your cameras terminal block on the manual, cos there are different terminal block for most of the 6113 coming from different region.
My own terminal block is labelled :
1: Audio GND
2: Audio OUT
3: Audio GND
4: Audio Input
5: GND
6: Digital inpute
7: Digiatl Output
8: 12V DC
Also a picture below for the type of mic u may need.
2. I don't think it has anything to do with software, i added a mic to the previous cam(7010L) i installed at a sight and the mic picked up when i plugged it.
Best of luck.