Hi Aleksey,
I’ll clarify. If you view the video bus track (Ctrl-shift-B), and then right-click in that track, then “insert-remove-envelope” and select Motion-Blur Amount… you can effectively/easily set motion blur for the video.
I had never had a use for the “bypass” option/button you pointed out, therefore had completely disregarded it.
THANK YOU!
Exactly what I was looking for. Now I can set the motion blur using the video bus track motion-blur envelope (sorry, I had originally said “master track” which is incorrect) and set set the bypass switch on the track(s) which hold background. VOILA! No keyframing of effects required, easy-peasy motion blur.
Thanks again to all who assisted 🙂
Gilles