NTi Audio Digirator DR2 - Manual (Page 42)

Dolby / DTS Signals
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Dolby ProLogic II
The Dolby ProLogic II format is an
uncompressed linear PCM format that
codes the channel assignment in the L/R
phase relation.
You will therefore find the ProLogic II files
in the WAVE folders, not in the Dolby
folder.
Levels
All announced levels of the non-linear
signals refer to audio levels prior its coding
into the non-linear format. Minor level
differences may occur due to the encoding
process.