FL 11 (and previous versions) it was possible in Slicex to enter the tempo of the sample, by setting the correct tempo in the "Sample Properties" of Slicex (right click on e.g. the "Tempo" area).
This ...
FL ---> audio interface outputs---> zoom's external input jack.
yes, i already tried sending FL's metronome---> mixer track---> audio interface output---> zoom's ext input, but for some reason the tempo does not change ...