I've just bought a Centro and I love to take voice notes, which I like to keep. I was pretty disappointed that I couldn't have Centro voice memos in my desktop, then I found your solution. However strange (the extension created by clie picture converter is jpg, so I had to change the extension to amr, as told), your solution worked great and saved me some bucks. To convert from amr to mp3 (or wav or whatever), I suggest Format Factory (
http://www.formatoz.com/), a superb media converter, donationware. I've tried Call Rec in my Centro, it works great and records calls too, but i don't need it, so i'll stick with the conversion (free) way.