I'm not arguing the fact of....... "If it passes the cable it is AN ANALOG SIGNAL. It may represent digital data, but it is an analog signal."
Remember I'm talking about a digital cable here. It's a single conductor, so it's either carrying a one or a zero at any given point in time. Whether it's carrying audio data at X hHz or just a timing signal at X kHz makes no difference-- it needs to be sending a CLEAN signal at X kHz all the time.
spend the $20 and buy a real S/PDIF cable.
good luck
ls