Disklavier

Hi Everybody, I have just recently purchased the dkc 850 upgrade. I am happy to report that this unit is everything that I had been expecting and more!! I have one problem with it. I cannot seem to get it to play
files through the analogue midi inputs. I am using a laptop with Vista. It will play the audio perfectly but the piano will not play along.
It is probably the operator!
I am wanting to purchase the squeezebox Duet system so that I can control all of my media from the handheld unit. I am hoping there is a way to play the disklavier files using this method. Any help would be appreciated.
In all other aspects I am very happy with the unit and highly reccomend it. The supplied manual does not explain the use for the analogue midi inputs properly.

Thanks in advance

Wayne