IThis leads me to the notion the 5 H9's could be combined on one H9 control app if USB was used to tie them together. Yes? No?
Yes, you can connect H9 Control to five H9s via USB. We've tested this before with a powered USB hub, and it worked fine. If you have a particular configuration you'd like us to check for you, let us know and we can do so. There are a lot of possible combinations — Mac, Windows, iOS devices via the Apple camera connection kit — and although I would expect you would be able to connect five devices via USB regardless of the combination, we could verify a particular combination for you if you need us to.