I will try that and see, hopefully it will work, but I am sure I had the ASPI Layers in place and had it working, and yes you assume right XP install.
But its easy enough to remove the layers and try
Nero's alone, we'll see, what bothers me is there is no place in the registry nor a ini file for Cd Speed that keeps this info, and if it does, then that may be what I a missing, but I doubt it.