I have a curious question for you. In our church, we have an orchestra (yeah, the every instrument, 25-30+ people kind). When I'm building loops, I'm always conscious of that.
I'm currently working on Tim Hughes's "God of Justice" and there's a really prominent cello part. For us, I'm making the loop to add ambiance and presence while not stomping on the part I'll write out for the cello section (which will mirror the recording). It seems that most folks are looking to have that sort of thing with a high quality sample in the loop (instead of played by a live musician). Which do you prefer? Do many of your ministries have cellists available?
Then there's a follow-up question... is anyone interested in actual paper music for a part like that in addition to the looped audio?