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Hey Gary @garyrc4aol-com ;
It is a pleasure to run into someone with a Bachelors in psychology who can understand the magic of Tony’s method. That’s usually what I find myself trying to explain to newcomers.
2 string strumming is rather advanced. I wouldn’t worry too much about it. That’s the whole thing about Tony’s method. Have fun trying and don’t try to master.
So first, whether you do it with the flat pick or your thumb, use one or more of the Monday technique lessons to drill your ability to hit each string by choice, even when skipping one or 2 strings. Here are 3 I’ve found that will teach you to hit the string you want. Once you have that skill, hitting a section of the 6 string area becomes much easier.
https://tonypolecastro.com/exercise/wu25-string-locater-flp/
https://tonypolecastro.com/exercise/wu14-travelling-pairs/
https://tonypolecastro.com/exercise/wu21-index-reference-flp/
These are not in any particular order, and it doesn’t really matter which one you use, just pick one and do it every day for a few minutes over at least a couple weeks, or even several months if you have the discipline.
Once you can reliably hit a certain area of the strings, using the method @Bill_Brown mentioned, string muting, and you’ll be able to make it sound like you’re hitting just the 2 strings. But again, work on the skills and have fun, because this skill will take months or even years to really get down. And not all chord shapes are useful for muting certain strings. All of this you will learn as your guitar journey unfolds.
Have fun and trust the process, Gary.
MG 😀