Disklavier

Hi,

I (really my wife) is the proud new owner of a Mark III Disklavier 
and am really excited about it. I am the technical assistant. I have 
a few questions and I hope I don't get carried away so soon. It is a 
great player piano, but we are interested in recording. 

First a simple question: What does it mean Audio/Midi In on the RCA 
input jack of the Sound Controller? Isn't it all audio whereas the 5-
pin DIN is the MIDI data in? What good is it if the MIDI in can't 
sync in real time. We have to mute the MIDI source even with the Key 
Delay turned off and that still is not satisfactory.

More advanced q's: 

1) Does anyone know what software is used to create the Pianosoft 
Plus CDs? 

2) Is it possible to mute the audio/vocal track of the PS+ CDs?

3) Is it possible to capture/record just the midi/instrumentation of 
the CD for playback on Disklavier?

4) Is there some legitimate way to copy these PS+ CDs? 

5) With Smart Key and a PS+ CD, we can record in sync and play back 
(very nice), but can't from the floppy or memory disk. Haven't tried 
it, but is it possible to put MIDI on the CD and record in sync from 
the keyboard.

TIA,
Fred