I also just noticed in the software apps for each, the minibrute's software lacks an option the microbrute has.. This is the clock or gate setting. If left on clock, the microbrute will do exactly what the minibrute does when synced to volca beats... A note is constantly played to each pulse regardless if sequencing is on or off. When changed to gate, it works.
Maybe if the Minibrute software had this gate or clock option in the sequencer settings, it might work? Come on Arturia!! Software update! Please give me a reason to keep this beautiful instrument!