Thanks for the friendly feedback! We had a great time recording this incredible instrument.
For me, the most elegant way to play it is to use Vienna Ensemble or Vienna Ensemble Pro to host as many instances of Vienna Instruments as the number of ranks you plan to combine. Set their MIDI channels to the same value (or keep manuals and pedals on separate channels, if you prefer that approach). Now you can combine ranks either by switching VE-tracks on and off, or by muting/unmuting them, while the sample-players will react to the same incoming MIDI notes.
HTH,
/Dietz - Vienna Symphonic Library