I'd have to look but if you search for "accessory connector" in the CPS help file you'll find a nice graphic and description of the acc pins.  If you're trying to do this in digital mode the audio level adjustments are a PITA and you're users will most likely complain about the digital audio coming over analog just because it's diffrent unless the analog users are familiar with the trbo system.  Let me know if you have more questions.