I’ve welded and tidied up some of the overlapping graphics and moved everything to the Blue C01 layer to make it more straightforward. I’ve then just added an all-encompassing rectangle to the same layer. The result of this is that everything inside it gets inverted. like this partial screenshot:
I’ve also attached the edited file to help you to see what I’ve done. You might want to choose a thicker font as it might not show up very well.
Hope this helps.
amplifier - edited MRW.lbrn2 (1.9 MB)