I have a ketron sd1, I upgrade to a better upgrade, which of the 3 that appear in ketron. it I have a ketron sd1, I upgrade to aI have a ketron sd1, I upgrade to a better upgrade, which of the 3 that appear in ketron. it I have a ketron sd1, I upgrade to a better upgrade, which of the 3 that appear in ketron. it is the best and most complete? the 3.0c / the ORG / or standard?the 3.0c / the ORG / or standard?, which of the 3 that appear in ketron. it is the best and most complete? the 3.0c / the ORG / or standard?the 3.0c / the ORG / or standard?