Hi Jeff,
That is a cool cat groove. I'm "new" to the BB/RB world. I ordered the Everything Pak 6 months ago and over the Holiday, had a chance to jump in a bit and try some things out with BB specifically.
Your post addressed one of my main issues as well. After digging a bit, it does in fact seem that inserting a style change mid song (when real tracks are used) does not work as one would like it to...apparently, the only real track that can change currently are the real drums...BUT, like other posters here suggested, there is a work around that unfortunately uses up an additional track and one has to mute the other during the change...and flop back again. Not that cool in my book...but plausible.
So, as you have stated, you have achieved the desired effect with RB...which is encouraging for me! I haven't even started to delve into RB yet.
I'm not sure how much of BB is the same within RB (meaning can I construct the basic frame in the same manner?) and then really get to customizing it by adding more tracks with definable styles and instruments at will...I hope so...as that would be true freedom of expression.
I noticed to that you also have a Motif XS (like me!) You play much better than I of course...it is good to know a fellow Motif man on the scene here. I absolutely adore that machine...one of the better investments...should probably take me to the end of my days here on earth.

BTW, in regards to the Motif, have you ever delved into making a custom patch map for the thing for playing BB/RB's MIDI stuff? I started down the road called "just getting it to work" and I used a patch map someone else created for a similar Yamaha product (the ES I think...previous generation)...just to get me going to check the response...it worked, but of course the patches are not what they appear. Just curious.
If there is anyone out there that has a patch map for the XS, I would be greatful for sure...no doubt that would take a tremendous amount of time. Maybe the guys at Motifator.com could do it as a support thing for users?
Anywho-I'll start delving into the RB manual and get educated a bit...meanwhile search here and scour the FAQ's and videos.
Great job with the song, I'd like to hear more...
Oh, again by the way, WHAT IS that chord you're using at the last turn around for the Em, Am, Em, Am, C,...and then B what? Can't figure the extension...B7#9 maybe? IE, 1,3,b7,#9 voicing?
Thanks again...if you have any tips, I'm all wet behing the ears.
Regards,
Eric