there is indeed confusing words. Chains in OT terms are either entire Arrangements following each other or Patterns chaining to the next Pattern from where they chain to the next and so on, which is then called Chain Behaviour (with smallest possible pattern change in 2 steps, also the reason why you can not have a pattern play only 1 step and chain to another even in arranger).

The rows in arranger representing Pattern with certain extra properties (Number, Repeats, Transposition, BPM, Mute’s, etc) are indeed called Arrangement ROW.

Changing a pattern on the OT should trigger to expose their according Program Change number via Midi if it was turned on in the project. The program change numbers follow a simple math…
starting with (i think) 0 to 15 for the first 16 patterns in bank A.
Bank B will follow with 16 to 31
Bank C then 32 to 47 and on and on…
So i expect (bare with me cause to lazy to test right know) that when the arranger goes thru its rows or you intentionally go to one of the rows which for sure have only one assigned pattern number and hit “yes” that your OT would expose the corresponding program change number with midi from where you can of course catch it with your DN.

The numbers should follow the fixed pattern scheme written above so the arranger with a wild sorting of patterns will also create a wild sorting of program change messages.

To avoid surprises it might be a good idea to test yourself… in example with snoize: MIDI Monitor and just change patterns on the OT and try to receive them and make sense of their number scheme, cause you will figure out there are limits to it to consider.

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