Hi. I have an EM-50... gonna sell it tho and get a yamaha RM1X mainly because I hate the idea of having to rely on preset patterns... Anyhow, to answer your question, quite simple really. Start your style, press the fill-to button, then almost immediately after that (before the fill in phrase finishes), wack the "original" button, witch will cause the fill-in to continue with the original mode of the style after it finishes with the fill in.
Hope I was off help. And I hope u also join me in my quest to make original music!
heh
jk

MachT