Fran, your posts opens so many doors about what is best to do.
1-What is the main thing you are trying to accomplish?
2-What has been successful so far?

For me, after a good keyboard set up, is freedom. (As a OMB)
When I had my band it was the right song with the right tempo and volume and relating to the people. I have stopped singing (the band kept playing) and said Happy birthday to, or guess who is here tonight. Freedom, Freedom.

Am I saying no recorded background? Only if it is a must.

My thoughts, John C.
PS, If I was backing a show every part of the show would be programmed – the importance is the show.