Gary Willis of Tribal Tech on finger pressure.
And man, it's good advice. Even on guitar, although I think it's worse on bass. But I have tried to teach two of three sons how to play guitar, and they've driven themselves to tears from squeezing the strings too hard.
One of the Guitar Craft things I've heard and not been able to internalize is Fripp saying you have to control how far you pull your fingers from the strings if you want to have efficient playing. I think I pull off too far, but then you can't get a decent hammer-on without some distance, too. But pushing down too far is probably just as bad. The death grip slows you down, it pulls you sharp, and it hurts your fingers, and it gives you nothing in return.