I'm not even sure, as it happens, that I got the correct up-to-date driver for my sound card. I find it is listed in "programs x86"....
Will install the most actual one which is supported by Win 10 64 bit. Let's see then. :-)
Ok, for the sound card, things are done now. And everything works fine, so far.
Now I shall have to see if, with Sonar's bit bridge, I can get this thing work. I wouldn't wish to miss the fine sounds I could tweak with it.