When you say "styles" are we to assume you mean soundpool styles?
When using the soundpools, you will select a style, then an instrument group, and you will see a range of samples/objects in the media pool window. If you right-click on any of the samples and click "Properties", you will be shown information about that sample including what key it is.
Above the media pool, there are seven numbered bars. These numbered bars provide you with seven different keys for the sound sample you have highlighted in the media pool. (For percussive samples, you may have seven different variations of the sample.) When you find the chord/key you want (assuming what you want is available), drag the sample into the arranger.
If what you want is not available in the soundpool, you can always create it in the Vita MIDI Editor using Revolta 2 or any other VSTi plug-in (assuming you're using the Premium version of MMM).
Using any version of music maker..how do we contruct chords from styles or soundpools? I understand drums stay the same..like if i want to change C chord to G7..??
It would have been nice if you had been more specific from the start.
As I already explained, that can't be done. Using the Soundpools, you can only work with what they give you. You cannot "change" chords of the soundpool objects. They are not editable in that manner.
If you want specific chords, you're going to have to create them yourself in the Vita MIDI Editor.