Congo Kid - Device outputting another channel

May be someone can help, I'm stucking with a patch problem.

I have a show on Congo Kid v7, and I want a device (address 160) to output the same values as another device (address 70),

I tried to multi patch through the Channels list channels column but without any results.

The conventional patch way through Output or Channel keys don't seem to be an option with devices, like my 2 Martin Rush 5 CH.

Hope someone can figure it out... Long time I didn't spend that time reading the full manual...

Thanks in advance, I searched all other but am not able to find any efficient advice.

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