yeah I know cmktech, the BB5s only control the inside pad (I meant outer on my last post) while the BB7s have dials for both pads, after a crash yesterday which also left my hand injured, the outer pad (the one that moves or master one) moved inwards, there is nothing I can do to prevent rotor rubbing since I can't move that pad.

Modulation is just how much you can control (or modulate) brake efficiency before wheel lock-up, a clear example of a brake without modulation would be Magura HS-33 on ground rims and grabby pads, a pull of the lever and your wheel is locked (this is good for what the brakes are meant for... trials) and you really have not much choice between a full lock up and no brake at all, this is ZERO modulation, this type of brake would suck in any other application since your wheel would lock, you would skid (or probably endo if its front) and you would be in dangerous situation but its obviously very favorable for trials.

A brake with tons of modulation can control your speed very well and is obviously preferred for every other discipline, the intensity of the brake will vary depending on the input at the lever and the wheels will slowly stop until wheel lock up, however modulation should not be confused with power, HS-33s have LOTS of power when combined with ground rims and grabby pads but their modulation sucks.

Modulation is always a good thing to have so the more the better, the only place where one wouldn't like (or maybe just even care) for modulation would be trials where the only thing you need to worry about is being able to lock the wheel nice and tight so it doesn't slip.

Hopes someones else can explain it better.