Disklavier

I am a new Disklavier owner with a MX500 upright with a DKC50R
Control Unit with an added CD player.  My dealer describes this as a
MarkII with the CD making it the same as a Mark III.  We love
everything about it except the pedal action seems to be eratic.

I do already have one complaint.  Yamaha PianoSoft Disks are like all
other music collections in that on any disk I find several songs that
I do not like for one reason or another.  I cannot understand why
Yamaha makes it impossible to backup and then reassemble my own
playlists.  I tried using DKVCOPY on my Windows 98 computer in DOS
mode using the 720k diskettes but got garbage on the backed up disks.
 Is there any way to really do what I want to do?

Thanks for any input.
Edwin