Ahh, i see where the confusion is now,
I class using a backing track as miming but you dont.
So when i play organ with one hand and strings with the other to me thats live,
When they play organ with one hand and strings on a backing track you still say thats live but i class that as miming because they cant play two seperate parts with two hands but instead they have to use a backing track,
When i watch a band i prefer them to play live, if they cant manage some parts then leave them out, join a duo if you want to play to a backing track.