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>>>...someone told me they generate multiple tracks using a single Realtrack and then export all of them to their DAW where they splice various bits together to get more control over the final track...>>>
It might have been me that said that. Here is an example of a song where I was able to find and edit real tracks to fit the melody I already had. It was largely serendipitous.
https://www.youtube.com/watch?v=rg6gF9siJeg&feature=plcpI beleive I used the "GEORGE" fiddle tracks used by the original poster. All the editing was done in Real Band.