Thanks for the detailed explanation Chris. This clarifies the whole fill issue for me. I did notice that many of the factory fills only contain riffs in the "major" section so when I fingered a minor or seventh, the fill sounded identical. Many of my user styles have riffs in the minor and seventh chord sections and I have now successfully use these to provide additional fills within the variation. Its a great feature to be able to program in new fills into my user styles or even copy over a factory style to a user bank and create new fill riffs in those. The WK8 has so many features under its hood that give me the ability to create a song just the way I'm hearing it in my head. It will be interesting to see what the new Gem arrangers offer. The sequencer in my WK8 rocks and I'm a veteran of computer sequencers since the cakewalk for dos days. Keep up the great work because you're helping so many people get the music out of their heads so others can enjoy it also.