Send VST-Audio signal to more then one Audio Output at the same time

For my own understanding, why do you have this challenge?

I never tried it, but I wonder if it could be possible to use several intances of GP each using a different Audio Interface. Then you could use the Bluecat Connector discussed in this forum to send audio from one instance to the other:

As mentioned by @dhj, the ASIO4ALL driver makes it possible to agregate audio interfaces in Windows, but the latency is awfull! Happy Mac users…