Previewing dts via optical out

I'm using DTS streams in DVD studio pro 4 (.cpt files). Although the manual says it can be previewed through the optical out on a G5 with an external DTS encoder, the DTS-stream can't be previewed, it simply doesn't work. (ac3 files are previewed ok in this way). (and by the way, after building a project the apple dvd-player does play the DTS through the same optical out.)
so how can I preview DTS in dvd-studio pro 4 with the optical out on a G5?
Geert

To listen to more than the default 2 channel output of a G5 you will need a PCI soundcard such as the M-Audio Revolution 5.1 (or some other more expensive PCI card or Firwire option) which provides 6 discrete analogue outputs from FCP and other mutlitrack sound editing applications (not, at the moment, from Soundtrack Pro).
The optical output only passes encoded streams of DTS and Dolby Digital as well as two channel audio.
DVD player and DVD Studio Pro 4.0 can pass encoded streams to the optical output.

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