On build v1.2.0.3, inputting:
^s ^bpm=150 hl_hev>.28 +0* *
...will output audio as if though a plus is on the last ditto, or:
^s ^bpm=150 hl_hev>.28 +0* +*
Note: the same behaviors happens even if the +0* is -0*, but with any number other than 0 it works as expected.