Substractive and Collective MIDI Assignment

[JordiTR]

Hi ! I would like to know how to assign MIDI external control to those synths. Most soft synths have a "MIDI learning" button somewhere on their interface to be able to dinamically assign hardware knobs and sliders to the soft synth parameters, but I can't find that option on Substrative and Collective, neither I can't find it on Collective manual. Thanks !!