1. When I add in a chord on the 3 jump I am playing holes 1, 2, and 3 at the same time. I’m also adding in some throat vibrato, which may be what is creating that different sound you are picking up!
2. No. These extra numbers below the other number mean you play all the numbers under an arrow at the same time. Ie: a chord 🙂 So, again in the 1,2, and 3 holes together!
Hope that helps!!