I don't have the Tchaikovsky's Suite No. 3 , but I have Debussy La Mer - Nocturnes from the same series and just confirmed I could rip it with foobar2k and then convert it to flac with AudioMuxer. I used the File/Open CD/Rip menu with Output Format = WAV in foobar2k to do the rip and then the Tools/Audio Conversion/Select Audio menu in AudioMuxer. I do have the ArcSoft DTS decoder installed in AudioMuxer; so maybe that makes a difference. When the WAV files are loaded in the Audio Conversion tool, it will recognize them as DTS WAV files if all is working. Here is a screen shot: