I have a very similar issue. Were you ever able to resolve this? I see no replies... and this is a major issue.
I bought the microfreak 6 days ago, and LOVE most of what it does, but I cannot get ARP working properly (consistently) inside my DAW, Cubase 12 pro.
C12 sync settings are correct as far as I know: microfreak is selected as sync target, always send START messages, TIMECODE sent in stop mode, MIDI clock follows project position, MIDI timecode follows project time
The first mF preset - Nervous Keys. If I try to arp this preset inside Cubase12, only one note plays. If I continuously tap on mF keys, the arp plays but instantly stops when I stop.
If I quit the DAW and play the mF by itself, Nervous Keys arpeggiates just fine.
If I cycle through many presets on the mF, which I have been doing every day since I bought it, I notice some presets will run patterns ok, but none will arpeggiate. I just tested another 20-30 presets while making this post, and yes - no arp preset works inside my DAW.
This is actually a fairly large issue. Does anyone have any additional info on this? If this cant be resolved, Ill be sending this back to my vendor ASAP.