[mcp6453[_2_]]

I'm trying to get input in Audition from the S/PDIF inputs on my M-Audio Delta
1010LT card. The source is a Lexicon MPX100 effects unit with an S/PDIF output.
Audio is getting into and out of the MPX100, as monitored through the analog
jacks. The S/PDIF output jack is connected to the red S/PDIF input jack on the
1010LT.

While I have read the manual multiple times, the current documentation does not
match the current driver software. (If there is updated documentation, I cannot
find it.) M-Audio wants a large sum of money for a support call.

What am I overlooking? I've been through the S/PDIF page in the M-Audio control
panel to find something checked that shouldn't be, or vice versa, but I can't
find it. Delta 1010 S/PDIF is selected as the input source in Audition in both
the [EV] mode and in multitrack. There is no audio at all, not even the nasty
digital noise when the invert selection is set incorrectly.