Another point of view

Option 1
Most users ask for styles for a certain song, therefore it is more sensible to find a good Midi file that matches what you want, and then break the track into loops to import into the style creator, thus giving you everything the style needs with just the selection of sounds and fine tuning being required. (You don’t need any fancy voices to make a good style)

Option 2
Do the same as professionals do, just download some of the 1000s of Midi loops available out there that are relevant to the style you want, (Make sure the loops have been designed for the instrumentation you are going to use) and then assemble a style using them. (Much like Workstation users use Arps)

It is very seldom you would ever need to create a style from scratch, (Except perhaps some simple versions that are nicely thinned out) plus while most home users need all the tracks to play along too, (They just want to sit down and play using all the easy play features they can find) professionals actually play the keyboard, so all that’s normally needed by them is Drums, Bass and a single ACC track. (Anything more usually just gets in the way)

BTW there are books available that you can teach yourself Rhythm (Style) programming, but unless you are working on something unique that no one has done before, it’s not really necessary for most players these days.

Bill