DPT-S1 exists in two versions:
- japanese
- english
the japanese version does NOT support english. All menus etc. are displayed in japanese only.
I guess it will be the same on the DPT-RP1.
If you need/want one now, go for a DPT-S1. Using it 1.5 years now and even my wife said that this was one of the best tech investments I made over the years. (And I buy way to much things)