Yamaha CVP 307 - Data Transfer from CD

by Dunc
(Uk)

Hello, I have a Clavinova CVP 307 bought in 2006 and would like to transfer songs from a USB my friend did In .wav format into the digital piano.

I've tried going through the manual instructions without success. I can hear the songs by using the aux in connections on the piano's speakers but can't transfer the actual data into the piano.
Any ideas would be very helpful.
Many thanks