Which software are you using?

When you select source/DVD/Options. Under the presets section you have:
PCM, DD, MPEG, DTS, and MLP

Trifield is listed in the PCM combo box. Its near the top of the list, you need to use the scroll bar to find it.

Stacey Spears
Co-Creator, Spears & Munsil High Definition Benchmark, Blu-ray Edition and Lighthouses of the Pacific Northwest.