In Tenn. they soak the ham in Ginger Ale for 6 hours, drain and soak again in fresh soda for another 6 hours.
One woman I know substitutes coke or regular cola for the second soaking.
People experiment with orange soda, and add concentrated orange juice to the brine.
Another I have seen done is to soak ham in WHITE vinegar for 8 hours, drain, the fat will peel away from the flesh, place back In bucket and then add the soda for another 6-8 hours.
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Not to forget soaking in Apple juice or cider, YUM.