I’m having this issue when i power up the OT. The first time i play a pattern, the midi doesn’t start for the first few trigs (can be up to a 16 trig cycle before it starts).
It also sometimes happens when switching patterns that use different parts.
As an example, Track 6 has a flex machine playing back a looped sample, when i switch pattern the part also switches, Track 6 now has a thru machine which is listening to an external synth, BUT just like when i first power up the OT, the midi doesnt start for the first few trigs.
edit: I forgot about trigging the thru track! Problem solved I think 