it worked with this formula in the expressions:
lt (modulatorValue, 0, 16383 – (abs(modulatorValue)), modulatorValue)
though in the first example of mine (the arpeggio speed) the -1 value is skiped (I can live with that), it works flawless with -96 +10 or -64 +64 ranges, by just configuring the min and max value of the component