Success!
I received the recommended cables today, kudos to @fennario .
I can now get a corner of the lower level turned into a little studio area… …perhaps when I gussy it up a bit more than this it might be worthy to post it in the “Show Us Your Practice Space” thread:
(extra credit goes to anyone who can identify the sheet music on that big beautiful screen… hint: I will be spending quite a bit of time with her )