There are two very good pages which may help you with this: the page on the audio commpression manager
http://www.nch.com.au/acm/index.html
and the one on sound formats
http://www.nch.com.au/acm/formats.html
I would also suggest looking on Sanyo's site, or querying them directly about the problem, but NCH's technical pages are extremely useful (although they're sometimes hard to find.. ehem, ehem!)
Hope that helps before or until the moderator can come up with something.