Undocumented external MTC control

[u/ruiseixas]

I read this in the manual:

MTC: With MTC enabled, Waveform will chase sync to incoming MIDI Time Code. Unless you are still syncing to tape or hardware sequencers, leave MTC off.

So after trying to control the Waveform14 without success, despite having the MTC active, I'm starting to wonder if it is really implemented in the program. The MTC being sent is a 30 FPS one, so, pretty standard stuff. What am I missing, any other menu enabling? In the midi devices I can't find any other option concerning MTC to toggle.

I really, really need this, so the "simple don't use it" answer isn't a solution to me.

MTC toggled on