Disklavier

Hi;

    I have a question on recording songs on the dk.

    My setup is as follows:

        Yamaha C1 Mark IIXG

    My problem is recording with a preselected voice.  You can select a voice 
or patch to accompany you while you play, but I cannot get it to record with 
the voice.
I either get just piano or just the patch.

    Do the parts have to be recorded seperately?

        Any help would be greatly appreciated.

                            Thanx

                            Jim