My private MAME083 /src/sound/ymf271.c modifies.
It's not perfect but better.
for Raiden Fighters BGM,some MS32game's voice and more.
Source file (/src/sound/ymf271.c only)
http://www.geocities.jp/t2du0000/ymf271.zip
MAME083 base CUI binary
http://www.geocities.jp/t2du0000/cui.zip
MAME083qa base GUI binary
http://www.geocities.jp/t2du0000/gui.zip
English doc
http://www.geocities.jp/t2du0000/e_doc_12jun04.txt
Japanese doc
http://www.geocities.jp/t2du0000/j_doc_12jun04.txt
enjoy!
T2DU as Toshiaki Nijiura