To add new ones, use the COPY function. Go to Media, select COPY, go to USB drive, find file and select it, they hit COPY TO. Then select the location you want to COPY TO, and select COPY.
Reverse the procedure to copy the files from the Korg to the USB, and then you can put them on computer.
Or you can connect the Korg to your computer using USB.
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DonM