I'm tying to do exatly the same thing : I've got the US disk with japanese voices and I want to open (or extract) the file layer0.cvm in order to get sound files. But I didn't find any cvm extractors...
leo @'d me in a thread about his last dream, stating he was passionately making out with a guy he used to know and then woke up while reaching for his crotch, and said that i would "know who 'tf' it is"
and of course i know, it's luke