Takeda,
You should be looking at the GW7. This keybaord has the same Arabic format as the EXR40oriental but it also includes Indian, Chineese and actual Asian instruments as well as Oriental (Arabic/Turkish).
The EXR40oriental is not an oriental instrument as in Asian countries but rather a middle eastern keyboard. Quarter tone tuning can also be done in the GW7 as well. There are no speakers but the sounds and look are more professional than the EXR40oriental and here in the USA it is even less espensive ($695.00 compared to $895.00 for the EXR40oriental). There are no built is speakers or floppy drive like on the EXR40oreintal but they both have USB ports to store additional styles and performances. Neither keyboard allows you to make your own styles. I prefer the Korg PA50 and Yamaha PSR3000 for these purposes.
George Kaye
Kaye's Music Scene
Reseda, California
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George Kaye
Kaye's Music Scene (Closed after 51 years)
West Hills, California
(Retired 2021)