To get the original full-quality 6-channel AC3 music, grab the MKV clips and mkvtoolnix (http://www.videohelp.com/tools/MKVtoolnix). Then use MKVExtract to extract the music. Just one video clip is needed as they all contain all three tracks. Ex:
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 2:01_smile_back_version.ac3
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 3:02_be_funny_to_version.ac3
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 4:03_laugh_out_version.ac3
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 2:01_smile_back_version.ac3
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 3:02_be_funny_to_version.ac3
mkvextract.exe tracks "Track 1 - Clip of the real world.mkv" --fullraw 4:03_laugh_out_version.ac3