Paul C,
The chants help keep your state. Outside thoughts will oftentimes get you out of state. It's rather hard to maintain an alpha state while thinking of the errands you have to run, or if you did this or that.
Since my mind tends to wanders like a nomad, I have found it helpful to tell myself in #2 of the 3-2-1 that "Any outside thought or distraction will be intercepted and converted into energy to put me deeper into state." It seems to do the trick. It's rather fun to feel my brain making that conversion.
I view the "state" for optimal pr results like soil. The better prepared the soil, with all the nutrients and water, the better the pr harvest.
--BReeves