In the Summary of Bebop Calisthentics 3A the markings on the left hand side are Lower and Upper SA, however I don’t see where we’ve covered the meaning of SA, unless I’m missing it completely. I’ve gone through the definitions of Approach tones but I’m just not seeing anywhere that illustrates the meaning for the abbreviation “SA”.
SA stands for Scale Approach which means it should be diatonic to the current scale versus “chromatic”. On the other hand you are right, the short explanation I included didn’t make it into the currently published version and there is no reason you could have guessed. It will appear in the next version upgrade to be released soon. Thanks for pointing it out…