you would need a d/a convertor:
http://www.ramelectronics.net/audio-...dGEF00232.html
and at $68 each, not a very cheap option...
from what i have read in the past on toslink outputs-- not sure if it applies to this one or not, but sometimes the toslink output will only work in certain modes-- some don't output stereo, others don't output surround...
also, that board does have analog audio outputs(their near the wifi antenna), so don't feel locked into only using the toslink output.