I have just bought 3 of the Privia 350s to work from my choir room, my home, and a sanctuary. I want to record to the piano at my home and be able to use the usb port to transport the work from piano to piano. They are all the same model purchased at the same time. I can get a recording on the piano, use the sequencer tracks. I formatted the usb to FAT32. Then I did the formatting on the keyboard suggested by the manual. I used the audio recorder button and put it on Track 1. I saved as SMF files. When I removed the usb and plugged it into my computer, I can pull up and play the files. However, when I put it back into the piano...it says that there are no media files. HELP!