I just stumbled upon the same issue. Was sequencing the AR with the Torso T-1 and placed some trigless trigs. It doesn’t affect the sound whatsoever.
Except… As mentioned above, if I hold down the trig, it starts to play the changes and it acts like a scene. Seems like this behaviour was reported about the DT in this thread.
I just tested and it works with the A4. While I would have loved if the trigless trigs worked with an external sequencer, this feature seems very promising for performance.