You have to go to VST Connections dialog (F4), External FX tab, click on Add External FX button, type Virus TI FX or whatever you want into Name box, set Send Configuration and Return Configuration to Stereo and click OK. Then expand the new external effect bus node and Send Bus node, and set S/PDIF under Send Bus nodes Device Port column. Before that you must remove the S/PDIF out from Outputs. After that you can insert the new external effect to any audio track.
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