Disklavier

I know that you can do CD Synchronized recording by selecting "SPS REC".

I have a bunch of digital audio files (WAV format) that I just copied from my computer to the 
Mark IV hard drive, and would like to add a synchronized piano part.  However, the SPS REC 
option is not available at least from what I can tell.

Am I missing something?  I would prefer not having to burn the audio files on a CD-R to do 
the synchronized recording.  An SPS REC function with WAV files already on the Disklavier 
hard drive seems like a good idea to me, but maybe I'm the only one who wants to do this?

Any thoughts?

Thanks.
Mario

http://marioajero.blogspot.com