I'm just a hack and haven't been playing that long so I'm not good on things like cut and boost Colin so I'll try and explain how it feels better to me:
when I turn the bass knob now there is a much smoother transition to a deeper bass thump, (is that boost?) more progressive than the original pot. The treble control is the same, the volume before was nothing, nothing, 'bl**dy hell that's loud' and now it's a lot more gradual, like it should be.
I don't understand why sterling put stuff out like this? to me it's quite unplayable without a lot of fiddling about with amp settings.
hope that helps.