Thanks for the answers!
I don’t exactly understand though how to do it? I can send out a clock from, for example DFAM, to the sync in of the Matrixbrute but how could I send a play/stop message along it too? Or how would I do it in a DAW? How did you do it exactly when you tested it?
If you're using the 3.5mm sync jacks, they are TRS (Tip, Ring Shield), so they carry both the clock and a run/stop signal, as mentioned. For this to work you must use a 3.5mm jack stereo cable.
When I tested, I connected MicroFreak Sync Out to MatrixBrute Sync In using a 3.5mm jack stereo cable, made sure the MxB MIDI clock source was set to Sync or All (set in the MCC or the system parameters mode called up with PRESET + MOD + SEQ) and that the MxB MIDI Sync button was on. By doing this the MxB sequencer starts and stops together with the MicroFreak. If you want to jam by playing the MxB sequencer from the keyboard while synced to a master, the MxB must have received one Start message for that to work.