For some drives an 80-wire cable is merely recommended and for others it's mandatory.
You don't need an ausio cable anymore - just make sure that "Enable digital audio..." is enabled for the drive and that you use digital playback in your audio playing programs (instead of analog playback).
I think digital audio playback is the default setting these days.
Pioneer DVR-112L, LiteOn SHM-165P6S, Pioneer DVR-111L, BenQ DW1655, Plextor PX-760A
LiteOn LH-20A1P, Optiarc AD-7203A, Matshita UJ-840S, Sony RDR-HX910, Sony RDR-HX750