Thanks, glad the cactus stuck with you!
Both, actually. While you’re picking, each animal shows how it feels about the current four cards, so you can swap a card and watch the reaction change before you play. Then during the song they comment bar by bar, things like “the middle drags”, so you can tell which measure did it.
The one thing you don’t know up front: listeners who are on the fence only make up their mind when the song ends.