RMX 1000 - CAN I ADD SAMPLE VIS USB RATHER THAN SD CARD

Hi i received my rmx 1000 yesterday and absolutely love it to death. The 1st fx unit that is really usable but have a couple of questions.

im just wondering if i can put my own samples on the unit via the usb cable rather than an sd card, from what i can tell it can only be done with and sd card which i find strange as doing it with usb via the rmx box program would be perfect but im just checking with you guys to see if it can be done.