Thanks, Rikki, ... From reading the posts, it seems to me that changing pads in a style on KORG is a lot easier, although I have never tried to have different pads in different variations of the same style ... 
And on KORG if one pad is playing and you press a button for another, the first keeps playing also ... I would think that it is designed that way to help 'build up' the style while changing through variations.  
Hi Tony,
Thank you for clarifying that for me.  I must have been using the pedal to stop first one playing after choosing the next one. Its been a long time since I used the pads on Pa4x. I had the keyboards packed up for over a year.  
My plan for the korg pads  originally was to create a library of looping piano, guitar pads , that could replace a  style track, not actually add  extra instruments to the style.  Could use pads for auditioning with various styles and then actually copy pad into the style itself , one to a certain degree  has a new style. Again, not normally the way a multi pad is used, but I ‘ve always liked the idea of having a phrase library 
The sx multi  pad  editing  and playback may not be as difficult as I had thought at first. I just had a wrong recollection of how the korg pads worked. ( failing memory) haha
One thing that was brilliant on the korg though, was that you could create a multi pad from a style track, and vice versa , a multi pad could be copied into a style and become one of the style tracks, very easily.
You can definitely mix n match your Multi-pads in the korg.