Even standard DVD soundtracks cannot be guaranteed to be correctly decoded by Toslink input equipped decoders. There is a disclaimer in the supplied owners manual to this effect. The player will save the user's selections allowing for customization of your outputs.
There is a possibility that standard DVD soundtracks might not be accurately decoded using Toslink input-equipped decoders. This risk is acknowledged in the user manual, and the player retains saved preferences for customization of outputs.