I will be setting all 12 taranis channels to 2milliseconds then progressively shorten the frame length from taranis while watching giga control to see what happens to the data arriving at the receiver.
A Multiplex "problem" is that it seems to use a very long synchronisation pulse (I think it was 9ms when i measured it about 10 years ago) and that slows down the frame rate, whereas Taranis adjusts to maintain just 4.3ms synchro pulse.