SOPP344: How do you articulate a unison?

This question was sent by Glenn. And he writes: Hi Vidas and Ausra! I love your podcast, especially that I can read the transcript when I am in a place where I can't listen. I have a question about articulation. When you have a sustained note, like in the first partial measure of BWV 603 right hand, and an adjacent voice that sounds the same note, how do you articulate it? Do you just hold the sustained note—then it seems like the adjacent voice just goes away! Or do you break the sustained note, to sort of make room for the converging voice? Then it seems you don't hear the sustained note like you should. Similar problem in the fourth measure. Am I missing something? Thank you. -Glenn