I don't know or care to know how the technology allows for this phenomenon you speak of, but I do know Yamaha is the VERY BEST in pulling this off.
_________________________
Yamaha 920 / Yamaha DGX-670 / Maui 5 Go (2) / Senn e935 / Sony C80 / Tascam DP24sd / ATEM Mini Pro switcher (studio)