A constant chore. I try to use pretty much the same bass and drums so it sounds like the same 'band' is playing the tunes. I usually, not always, remove string sections - I think, at times it sounds a little hoaky, a single act with a full string section. I usually change the brass licks and fills to something a little softer. Everything is saved as a registration, I very rarely just pick a style and run on a gig.
Ciao,
Jerry