tried it again briefly today and this time went into the arranger effects buttons to see how the speaker modeling function works. Iwent in a tried several speaker type settings . They did alter the sound quite a bit from the speakers but it still sounded quite filtered. I am comparing the speakers sound to the Pax and there is a real difference in the speaker sound quality. I think the speaker modeling function is really just a fun gimick but unless someone can demonstrate differently , has very little practical use especially as each track on the keyboard can be individually eq'd to the players tastes. Roland should have spent a little bit more on the internal speakers or just left them off the keyboard