I found the answer to my own question, but will post here in case anyone else finds this useful.
Essentially, you can use the Mac terminal two open a second instance of the H90 Control app.
Here are the Steps:
- Go ahead and open your first instance of H90 Control (and connect to one of your H90 pedals)
- Next, open the Terminal app (generally found in the Applications/Utilities/ folder).
- in Terminal, navigate to the Eventide folder in your Applications folder. For me, this is done with the following command: cd /Volumes/Macintosh\ HD/Applications/Eventide (depending on your file structure, this part may be different for you)
- Finally, typing the following command in Terminal will open a second instance of the H90 Control app: open -n H90\ Control.app
Hope this info helps someone else. (Image attached)