uh, no problem with .dff (although .dsf are preferable in my opinion, because of additionnal – non musical – data). BUT if the .iso is recognised by sacd_extract.exe GUI, it can produce a .cue, but NO .dsf nor .dff; and foobar2000 can produce .wav, but not yet .dsf (by current design). Well, I don't dare to ask you to put .dsf on Israbox, but if you're kind enough to do that, thank you in advance!