I don't know what all you've tried, but here's how I'd do it based on how I have my 750 set up. Run the trigger cable from the main trigger output on the 950 to the 770's trigger input. Turn on the 950. Turn on the 770 with the front power switch (also need the rear "master" power on, of course). Now, when you turn the 950 off the 770 will also go off. And when you turn the 950 back on the 770 should come back on, too.

That any help?

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