So when you say "the four top strands," would that be the red on a non-rainbowy cable and the 3 greys next to it? I have a spare grey cable, but "top" and "bottom" are kind of ambiguous.
(I think we talked about it in Discord, but for people who weren't in on that or who don't have their own ribbon cable connector presses...)
Yes! that's right. On the grey ribbon, it would be the red one and the next three that you should leave intact in order to keep the ground and +5v available throughout the synth. I've edited the first post to make it clearer. Thanks!
... also, just adding that, although a ribbon cable pressing tool exists and makes this much easier, I don't have one. I just mash them down with a pair of pliers or multi-grips, vice-grips etc (tools of last resort that end up being used first).
Interesting I've been thinking about connecting two powered cases via a modified ribbon cable where I cut the 5v lines so I can patch from one case to the other without the need to patch some extra ground connection.