How to join the nodes from different layers together into one shape?

Hi guys,
like it in the attached file, i wanna join the nodes from 2 differents layers together, i have tried the ctl +j and manuelly dragged the nodes together in the node editing mode, but it just didnt seem to be working. can we actually join them together? because i would like to set up different speed to each layer
much appreciated!
snap

hey guys, i have just found the link below for the answer .

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