thank you all
I discovered an important thing: if I move the track vertically with the position command of the 7A16A plug-in also the readout moves as if it were a single screen, instead the readout should stay still if I move the track vertically!
I wrote that the readout danced instead is because it follows the movement of the sine wave present on the screen sent through the generator connected to the input of the 7A16A plug-in.
But now I don't know what could create this anomaly.
Thanks for your help.