I use a generic adaptor to convert Toslink to 1/8 minijack and the Mac OS can identify it and change the audio output to digital output. But I found no signal actually has been "output" (no red light from the adapter) >< I dunno how to describe it and hope the picture can explain what's going on.
From the picture we can see the jack has been set as digital output automatically but in "Audio/Midi" there is no digital output available.
I tested the adapter on my CD player and it works fine (when I plug it on there is red light come from the adapter).
Thanks in advance