Hi! I would like to hear what would be the most important changes if I would upgrade from X1 Studio to Sonar Professional. Also, I have understood the new Sonar would work with Vista, right?

It CAN work with Vista but not recommended or guaranteed.

There is a feature list that will tell you about the many changes. It's on the Cakewalk website, have a bit of a look around there is so much information. Documents as well as videos

The new Sonar Artist, Producer or Platinum are far more advanced than Sonar X1.

Thanks for the quick answer. I was under the impression that the new Sonar had similar requirements than the x3. If there are any Vista users there I would like to hear experiences with the X3 or the new Sonar.