Yes, all changes you make are stored within the style file.
Since recording that video, things have moved on quite a bit for me. Sound wise I now have 100% compatibility with Live Arranger and don't have to do much in the way of tweaking anything other than to appeal to my personal tastes. I'm not an arranger user though so I'm not too interested getting this part of the keyboard up and running to a standard I'd go gig with. I've also not explored this function as much as the likes of Dennis has, which I believe he ran into a few problems.
Live Arranger is not a Lionstracs program, it's third party software that I think the developer was having problems debugging.
That said, I think when OS 5.0 comes out the new Qranger (Lionstracs own arranger) will be one to watch. A single style can contain midi data, audio style data, and even the Giga files needed to run the style.
All that can then be packed down into a Zip file which the keyboard can read from.
Tastenpoint are also supposedly going to release a few hundred styles (we will see). So maybe soon the Mediastation / Groove Series might be that all singing and dancing arranger those who don't want to have to build up their own collections are looking for.
Who knows, I might even develop my own if it's worth the effort.
Regards
James