Hi! I did spend a good part of the day, yesterday, trying to work out why my brand new Analog Four MkII was spitting out wobbly, fast pitch shifty up/down kind of sound on every preset, as soon as it was triggered by MIDI master keyboard. After much experimenting, midi filtering and monitoring, googling, I’ve learned about High Resolution Velocity Prefix thing 
which some Casio keyboards and software like Modartt Pianoteq support. Apparently, it sends additional velocity sensitivity messages on MIDI cc#88, which creates a problem with Elektron gear. Analog Four cc#88 is assigned to Vibrato Depth parameter, in Digitone to FM Parameter Env Reset.
I do use Casio Celviano clavinova type piano as a master keyboard in my set-up, I just like the feel of that actual keyboard. Did not notice any issues before with any other gear, Digitone Keys, for example, did not exhibit anything noticeable. Well, I hope this might be useful to someone.
Solution found to filter out cc#88 and the problem solved.
Cheers
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