The modifier functions for the space mouse

The squared function (modFunc = 1):
$y = x^a \cdot sign(x)$

The squared tangens function (modFunc = 3):
$y = \frac {tan(b \cdot (|x|^a \cdot sign(x)))}{tan(b)}$

Visualization

Parameter a - Slope at zero:
From linear y = x to cubic y = x³. Bigger value flattens the curve more near zero.
a= 1.15

Parameter b - Slope at end:
Bigger value increases the curve more away from zero (on MODFUNC 3)
b = 1.15