Do you have a recording of this tune that could give you some indication?
Since the asterisk is always on the higher octave following the lower octave note, I would agree with your idea that it indicates a “pop” after a slap. It seems, however, an uncommon way to denote this, as most often you’d see the letters “T” (slap) and “P” (pop).
Learning different people’s eccentricities with notation is part of the fun of notation!
I was trying to read through this, and got very hung up on the eighth note rests, since they start to look a lot like natural symbols at some points.
But it works! And it looks lovely.
There is an art to well scribed notation that I absolutely adore.
Yeah, auto-correct is often maddening and sometimes unintentionally funny.
Not the same thing, and the OP likely can’t correct the misspelling in the thread title, but the correct spelling of the star-like glyph in question is asterisk.