Thanks again, John.

The manual says that the backlash can be added in or on, and it was the case in the previous software I used. I did not find a way to set the backlash "in" with Ekos/Indi, it is always "out" (ie the correction is only applied after inwards moves). In itself it is strange.
Also, I did not get unpredictable behavior with previous software and the same hardware. Of course, perhaps I just failed to notice, one can never be sure... but in ten years or regular and fruitful sessions I am quite confident. That is why I think that somewhere (in the indi driver, in the linear 1pass...) I poorly chosed a parameter value. But which one ? It seems (emphasize on "seems") that the ability of linear 1pass to find the right solution is not affected. Since the quest is quite time consuming, can we at least have a shortlist of suspects?

Regards,
Philippe

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