Paul, I am not saying that the Korg device cannot export in those formats, both you and Alan have now told me that it can. I am saying that Korg do not reveal this information anywhere on their website. I cannot be wrong in interpreting information that is not provided. I know that I have limited eyesight but cannot see any reference to standard DSD files ( i.e. .dsf, .dff) by Korg. Here is the spec from their website and there is no reference to the Korg device supporting either of those formats:
Further the information that Korg provides about replay mentions using AudioGate exclusively for this.