I will probably Call Steinberg Support tomorrow.
one step further, but no chance of success yet.
when Cubase is maximised, sound from outside cubase is fine
when I maximize cubase, the distortion comes back.
also, the soundoutput selected as default from Windows Control Panel is not available for selection in VST Connections, no matter which output I Select.
I must chose another output than the one that actually has sound on it!
I dont get this.