Yes, that is possible:
on SAT, you need to enable the file- system of the VAL- board you are going to FTP to:
enable filesystem board <boardlocation> login <ftplogin> <ftppassword>
then go to your FTP- client and upload the WAV- file into the root- directory of the board, using the login/pw you have set up before, make sure you use a binary transfer.
After the file/files have been ftp’ed onto the board, disable the file system
disable filesystem board <boardlocation>
regards,
Frank