Hello!
So what you could do to fix this is basically send it as a master playback which allows ONYX to select what it wants to do. (Just like set your master buttons normally)
If you don’t use the masters you can only send go, pause, release, select and toggle.
I could fiddle around with OSC and see if i can find any solutions for you and me. From what iv’e understood many people/technicians want the “flash” function for OSC playback buttons.
I hope this helps!
//Martin Hedstrom