I’m not sure what via trig conditions means, but you do realise that Trig Conditions are just a True/False on whether a Trig plays or not, it has nothing to do with what the trig will do, just whether it exists … so I don’t see the connection
Anyway, Trig conditions are not the issue here, this issue is getting the OT to play the correct slice via external MIDI, there are a few detailed posts and threads on this, but here’s a post I made on the issue which makes sense to me