Ah, sorry; I've not been reading this for a while. The output is whatever you get from a Cirrus 7212's DAI port (try the cirrus website).

The audiotron, which also uses the 7212/7312, uses an 8405 for S/PDIF out, which means that it should work... see http://www.gweep.net/~prefect/eng/audiotron/audio.html

Hugo