Vol 32 was just released this month. Vol 31 was sometimes in feb-march 08. You are right! Looking at masecos4.idx with a hex editor reveals blocks of data with plain readable english title and some unmarked vietnamese. I "found" an upload of the idx file.
http://www.box.net/shared/d0kidoww0cI also found the producer website. They have published the complete alphabetical PDF of Vietnamese song list up to the latest vol 32:
http://www.arirang.com.vn/?page=static_pages&view=99&l=2http://www.arirang.com.vn/image_manager/16/File/list%20nhac%20tong%20hop%20(1-31).pdfI think the other interesting goal is to work out how to extract/insert midi file from/into the DVD !
