Thanks @Andrew!
I played around with the fingering on the third piece to find something that worked comfortably for me. I think I know what to do now to record directly to the macbook from the fully electric uke: plug my wired earbuds with the extender cable into the mac. And — I’ll pluck three notes rather than rapping on the body as my “match video and sound” signal since rapping on the body didn’t record from the direct mac to uke connection.
Linda