Unfortunately, my keyboard doesn't allow me to reconfigure MIDI stuff, yet as "everything else" (like pitch wheel) just works modulation was the only "stopper", so I felt it was worth to have one single option that can solve the problem on the MicroFreak and make small / cheap controller keyboards usable without using an external host.
Yet that small midi utility does the trick, thanks again.
BTW it's so good to have control over "pressure" without the capacitive aftertouch: sometimes is decent, sometimes my finger just don't want to connect and licking my finger all the time it's not very appealing.