@eight here at our university we use the Hollyland Mars 4K for Kameras: https://www.hollyland.com/product/mars-4k They are cheaper than Teradek but they have a delay, they say 60ms on the website but its rather 70ms.
I can't say I have much experience with Surge XT so I might be missing something, but have you setup your Midi in and out normally under the Isadora communications/Midi Setup dialog, and ensured the midi in port of the VST actor is set to match?
Yes, both files need to be opened by the same version of Isadora. Open one izzy file, then use the file/open menu to open the other file. When opened in the same version of Isadora you should be able to copy and paste scene from one to the other.
