Disklavier

Hopefully someone out there can give us some help on this question ... 
we have a 6 month old Mark IV running 2.0 software and we want to 
record a piano piece that my daughter's accompanist recorded onto our 
piano's hard drive and burn the recording onto a CD so that we can use 
the CD in a regular CD player to accpmpany my daughter at a vocal 
audition. Is the only way to do this is to use a tape recorder or a PC 
with a micropuone and place it in the room with the piano and then 
record the piano playing the song we need?
Thanks