Don't overlook the drivers suggestion Raymond. It sounds like that to me.
I searched the Web and found no 64bits drivers. I updated the firmware to the latest available.
Since I am using XP64/SONAR5 I made that Chopin-sequence and put that on CD with success. Since I am using XP64/SONAR8 - in time a bit later - I made another piano CD with success, using Plextools (sometimes I use the writing/burning part of Adobe Audition) - date stamp 5-1-2009 rather recent,don't you think so?). All recorded on the same media!!!
All tests (Q-tests, etc...) were successful, but still the DVDR doesn't write any AUDIO info to the CD. When loading again: windows says (and not only windows): empty CD, while others are flagged as AudioCD.
Maybe it has to do with the laser intensity/setting/lens. When I purchased the full Pro Steinway, during installation time, I encountered problems reading the installation DVD's. I had to lower down the reading speed, else those DVD's were un-readable. Maybe some manyfacturers fault... or whatever.
Tomorrow I will purchase another.
Thank you all folks for your effort to get this sorted out, for now I have to give my wife the attention she needs.