Pam as master?

[XORadmin]

Though it doesn’t immediately strike me as related to the phase aspect you mention, but since you didn’t note it in your post and it might help eliminate variables: Are you also sending a run signal from Pam’s? If not then you should do so by configuring one of her outputs to go high when a button press starts Pam running. Patch that into the NerdSEQ reset input.

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PS - 6X is right.

PPS - If you need Pam to drive the NerdSEQ for long then either of the Pam’s expanders would be a good buy.

I have been wondering about the reset, and yes, the expander is on the wish list, although x6 is not one of the options. All valuable comments, and thanks for the validation on 6x.  

With or without the Reset added, Nerd steps each time Pam's light goes out. This indicates two me that Nerd steps on the falling edge. I thought most things step on the rising edge?

It does not step on a falling edge. That would be wrong.

24ppqn is advised and if possible then as DINsync, because you get a proper start signal for free then.
I think there is maybe something with pamelas setting which inverts the signal?
And are you sure that this happens or is it an optical observation? I know many people are clocking the NerdSEQ through pamelas properly.