Hi. In some performance I've seen "[a|b|c]" apparently for making a (pseudo) random choice. It's currently not in https://tidalcycles.org/Mini_notation_syntax .
I see the implementation (https://github.com/tidalcycles/Tidal/blob/main/src/Sound/Tidal/ParseBP.hs#L409) but it's hard to deduce the intention, in particular, the interaction with other features of the notation, as in
*** Exception: Syntax error in sequence: "[0|1|2,3|4|5]" ^ unexpected ","
I am not seeing any test cases (I looked in ParseTest.hs). If you could post some (here), I can collect them into a PR for the repo.
It is a semantical function? The implementation
(https://github.com/tidalcycles/Tidal/blob/main/src/Sound/Tidal/ParseBP.hs#L119) is calling
toPat on the children of
But it's more, since it also diversifies the randomness (by fudging the timing).