Frustrated with this myself. I use Studio One 3, and I can use the MicroBrute as a MIDI control to play VST plugins all day long but for some reason I can not send midi to the MicroBrute from Studio One 3.
I have however, been able to do so from within Native Instruments Machine MKII, so I know that the capability for my PC to send midi to the MicroBrute is there (both the MB and NI M are connected via USB to my pc, theres no direct midi cable to each other). Caveat is when I load Machine as a VST plugin into Studio One 3, then the midi section of Preferences/Options disappears.
Frustrating.