Bernie....
When I change instruments in any registration, many, most, or all are selected from the Memory of tweaked sounds in Sound Group.... I nearly always change the part 4 sound.
There are so many options available in the 7K that I have yet to
run out of "new" things to work with to make changes and keep my
music "fresh" and "interesting" to everyone....
Many of my Nursing Home "peeps" were pro musicians. They have been very helpful in suggesting instrument combinations to try in the registrations...
One of the things I do is try a variety of rhythms and sounds with many "old favorite" pieces. For most of the religious pieces I use other types of rhythms...Example: "Just A Closer Walk"... to the "Gospel Shuffle"... Always puts a smile on their faces....No slow somber rhythms for those religious pieces!! Latin rhythms are favorites for many popular pieces too.
My recommendation is to try whatever comes to mind as you explore the amazing 7K! Please your own ear and most likely you will also please your audience...Attempting to copy the sounds of the successful recording is just not fun for me... Having fun is what music and life is about for me!
Elizabeth