bartveld
Thanks for all the input. Yes, in X1 WAI is there, but again: the hardware slider does influence the software, but not vice versa (i.e. changing volume in software doesn't make the hardware slider move). This must be some setting, but which? And also, the transport buttons on the VS-100 don't light up at all (but they do function).
When you setup the VS-100 as a control surface, did you assign the "output" back to the VS? It sounds to me like the VS can feed to Sonar, but not receive from it.
1: Press P to open the preferences
2: Go to MIDI > Devices
3: Make sure "CONTROL VS-100" is checked for both INPUT and OUTPUT
4: Now go to MIDI > Control Surfaces
5: For the VS-100, your IN should be set to "CONTROL VS-100" and your out must be set to "CONTROL VS-100".
If that is how you have it set and it still doesn't work - you will have to call Cake tech support.
And the question remains how to make VS-100 work on 8.3 (i have both versions on my system).
It should work the same as in X1. You can loosely use the steps I mention above, but of course, the Preferences windows are very different in Sonar 8 than they are in X1. Just find all the appropriate windows for settings, and you should be able to set it up.
I don't use Sonar 8.3 myself so I am not 100% sure the VS works with it. But I do use 8.5.3, and it definitely works there.
Good luck!