6-Whispers Noodles by wuc - struggling to find the break in

[SudokuFan]

Hello all, this puzzle is one I've been looking at as recommended by James Sinclair:

https://logic-masters.de/Raetselportal/R...?id=000KEM  

It is low rated on difficulty but I'm clearly missing something about the rules because I'm struggling. I have been doing colouring and I've identified things like 4,5 and 6 not being able to be placed on whispers and 3 and 7 only having one possible partner. But after 3 restarts I keep running into trouble when trying to break in and haven't found a way to actually convert my colouring into identifying the correct polarity of either low (1,2,3) or high (7,8,9).

Any tips to let me try and figure out what I'm missing? 

Thanks so much.

"I keep running into trouble when trying to break in and haven't found a way to actually convert my colouring into identifying the correct polarity of either low (1,2,3) or high (7,8,9)" just guess one of them and swap 1 with 9, 2 with 8, 3 with 7, and 4 with 6 if the black dot breaks