mapping ui should allow amount to go beyond edges of knob

[spiricom]

for instance, let's say you are mapping something with an initial value of 0 and you set the A knob to make it go higher. But you want some other control to make it go lower. It should be possible to add the second mapping source (like knob B) making it go negative, but now it clips at the knob extents on the UI, rather then just at the final stage of mapping calculation. (init of 0 plus .5 A plus .5 B should equal zero. init of 0 plus .1 A plus .5 B should also equal zero, since the negative value gets clipped, same as going above 1).

[spiricom]

(init of 0 plus .9 A and .1 B should equal .8. But right now you can't map a negative amount if the knob position is in the middle, and likewise your mapping amount is always limited by the initial knob position, but it shouldn't be).

[spiricom]

in previous comment I meant "knob position is at zero"