Drdalet wrote:
In my case I would have to edit everything, voices, play notes, correct reverb and panning, so why not start from scratch?

Well, I have a feeling that, if you edit an existing multipad, your timing problems would "magically" disappear...
Furthermore, if you can be satisfied with a drums multipad (i.e. one with only percussive sounds), you could get away just modifying the drums notes. Personally, I would never try to create a multipad or a style using Megavoices.
Good luck in your endeavour.