Hi all,
I’m a lucky pocket operators owner (I live in Paris, France and ordered them right after they were available on the Colette store).
Anyway, I confirm that it works using a pulse sample on a cue’d track. It’s actually one of the first tests I did. Here is a crappy demo 
https://soundcloud.com/qlamerand/pocket-operators
Another working solution I tested - that I prefer as it frees the cue outputs - is to use Korg SyncKontrol https://itunes.apple.com/us/app/korg-synckontrol-for-monotribe/id438617344?mt=8 on my iPhone. I sync it in MIDI using a MIDI compliant USB interface + Apple camera kit and connect the POs to the headphone output via a Belkin RocksStar.