Thanks, yes will check out the Vienna Konzerthaus organ once I figure out how to manipulate registrations easily ;-) (hint)
It's the same little plus sign with Hauptwerk, yes, and it looks exactly the same as in your 2nd picture. But I'm at a loss as to what to do in Hauptwerk. The manual says that multiple audio output is only possible through audio hardware... I wonder... pp 136, 160 and 180 here:https://dl.dropboxusercontent.com/u/43359256/HauptwerkInstallationAndUserGuide.pdf
HW finds my Virtual Audio Cables and I can probably use those rather than the VST, but how would I get that audio into MIR?