Hmm, last thing I heard was that this app isn't Japan only after all...
The "*FOR JAPAN ONLY" just refer to the specs (release date, price and distributor), which will obviously vary from country to country...And as Korg is a japanese company, it's just natural they're releasing it in japan first, just like all the japanese game devs do...
It's not like it would stop anyone here from getting their hands on this program if it was a Japan exlusive, anyway
For those who are actually going to buy the DS-10 there's still play-asia...
I also doubt that any text will be in japanese, except for
maybe some functions like saving or loading projects, but not the synthesizer itself...
Have you
ever seen a synthesizer with knobs labelled with japanese characters?
Look:
If you squint, you can clearly see the english text...
Maybe if the program has some kind of instruction manual or direct help function built-in, it'd probably be in japanese, but who knows...
The casual user won't know what the heck he's doing even if the text is in english, anyway