Not really impractical, it would in fact be easy to do, as said, at the mixing stage just a matter of saving a copy once the main vocals and "Live" instrument backing were mixed and prior to the "Extras" were mixed in.

Might be easier to include two CDs one of each mix, you could even offer a discount of your next CD if one of them is traded in - in that way you could find out which of the mixes your listening public preferred and the cost would be negligible.

And if you're into vinyl what about a 3 sided LP? Monty Python did it with Matching Tie & Hank set - now there is a challenge ;-)

As a matter of interest we always use tracks from our CDs for the interval music, so at least potential buyers have a better idea of what they sound like in comparison to us live (we play tracks that aren't on the song list for that venue though)

PB

PB