I'm getting conflicting information from PG Music. I'm running 2011 and this is my problem (trying to find out if 2012 rectified the problem):

I create a song... then halfway through, for example, I want to change the style. I go to the 'change style' process and I'm able to select any style. However, I want to know what that style sounds like to see if it works with the original style. In version 2011 you cannot rehearse/hear the intended style change. You have to make your selection and then play your song... and if you don't like it, you have to go through the whole process again to listen to the new style.

Did 2012 fix this... can you change style at any point in the song and rehearse any new style before saying "yes, that's what I want at bar 42 (or wherever)... or do you have to do the same thing... pick a new style, exit to the original song window and listen... or can you rehearse/hear the intended style change first?