Toslink is the optical cable.
You said in one of the earlier posts that your getting audio out of your tv. Did you plug the white/red of the composite cables into your tv? there is a white/red bundled together, and a red/blue/green bundled together. The r/b/g ones are video, the r/w are audio make sure those are unplugged.
Does your dvdcombo reciever have a setup menu? Does it support DD inputs?
what model is it?