I hear you, originally it was A0-3 and B0-3, then it felt ‘too scientific’ and change it to reflect the fader position, that’s why top and bottom. But i was never convinced either.
What about Up and Down?
I also changed 2Q and 4Q for fade and mult. They illustrate better the ‘what’ instead of the ‘how’.
A graphic designer is helping me with the graphics, although the layout is set.
RGB signals coming from example from TBC2 into channels 1 to 3 and use any signal in channel 0 cv as a cheap soft mask to multiply or fade. Then offset the the rgb colours with the v1-3 faders.