The A and B pedals together are probably the most characteristic sound of pedal steel guitar. That's pretty much where it lives, isn't it? And so all you're doing is the A pedal, is raising the B note to a C sharp while the B pedal raises the G sharp note to an A. Now, if you do those things together and you start with an E chord, when you hit them together, it becomes an A. Now, as is the case with a lot of these things, these positions are good in all of the grips that are available to you in the major chord. So, we've got 10-8-6. We've got 8-6-5. We've got 6-5-4. We've got 4-5-3. I mean, 5-4-3. You can also play one or both ends off the middle, especially by releasing the A pedal and keeping the B pedal down. You can also do the opposite. Stay on the A, and so on and so forth. Anyway, that's what your A and B pedals do. They give you, together, the fourth of whatever it is, the root that you're on. So, if you're in the G fret, the fourth is going to be C. If you're in A, the fourth is going to be D. If you're in C, the fourth is going to be F, and so on and so forth. That's it for the A and B's.