Seems an awfully expensive way to DJ, if you are still thinking about that hairbrained idea to have the vocals done by recordings, while you play along with them!
No offense, deb, but that IS the silliest thing I've heard in a long time. How about you go DO IT first, then come here and tell us how much the audience loves it?
Not very much point suggesting it until you beta test it, is there?
Don't forget to write...
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An arranger is just a tool. What matters is what you build with it..!