Hi All-
I've got an original tuner that I'll be fitting up with my empeg when I do the car install.
So far, however, I haven't found much in the way of documentation wrt the option.
As well as the antenna connection and 8-pole signal connector, there is another (female) jack... what's that for?
Also, there is an adjustment knob labeled with positions 0-9 and part of the alphabet. Whazzat do? Where/how should it be set?

I couldn't find any discussion on the BBS or in the FAQ about this stuff, but if there is something I've missed please link it.
Thanks a lot!
Stew