Scott, for those just starting off on this journey (software based arranger system), I would recommend converting the styles to GM or GM2 format. This will give you many options for wavetables - especially Roland or Soundfont. It is a great deal of boring work but it is worth it. I for example am now using the Colossus 14 GB or so GM wavetable. Sounds terrific.
However, you would need to change each time you change to other formats. If you don't you could end up with howling dogs, pianos playing and so on .... all in the wrong places.