I check my BBBB which is Sys 11c. It does not have anything plugged into J1 either. In the manual, it list these pins as NC (no connection). So, Sys 11c does not need this cable, correct?
I need to check my Whirlwind and Big Guns to see if anything is plugged into J1 on sound board.
Where does the cable plug in from J1 on the sound board? Does it plug into the MPU? Which plug?