Not sure of all the formats. What I've done on numerous occasion is take wav samples and convert them over. I would assume other sample formats would work. What you're doing is taking the sample. Loading it into the Casio software. You then set your key points, then when you're finished with the sound the software will convert the file to "Casio Format". Of course their will be minor restrictions... You can't convert really large files on the 3000/3500, but with the newer models I would only assume you could due to the new models having twice the sample memory.

Squeak