I play in between some of the prerecorded intros/endings all the time whats the big deal?...were not fooling anyone just think of it as playing with a band & your waiting to come in on your parts...why do people think they are so Pure..High & Mighty?...there's no way around it, if you play an arranger KB you are the operator of an automatic generated music machine...be proud of it instead of trying to be pretend to be something your not.
If you want to be a purist don't play an auto arranger.