I think you may be over complicating it (and us too ), Lucky. One of the things that IS easy to do on Korg's is to swap parts around from style to style. So, if you have a too busy drum track, and can find a less busy drum track from another style that fits, it's fairly easy to swap. And, as Rikki points out, there are a LOT of Technics, Roland and earlier Korg styles floating around that may be a lot simpler. These might be a good source of patterns to bring into the style you want to create... (or be just right as is)

Bottom line is, it honestly doesn't matter WHAT you buy. If you want things to be EXACTLY the way you want them to be, you are going to have to do it yourself! For a start off, what programmer knows EXACTLY what you want in the first place...? And how sure is he that anyone else wants it that way, either?

The whole problem with buying styles is, with no copy protection, there's very little in it for a talented style maker. He'll sell a few, then SOMEONE is bound to upload it somewhere, and there goes the rest of his money! Until they build in the kind of copy protection that iTunes has (and even that is circumventable if you are determined enough) into the arrangers themselves, the people that make styles have no way to recoup their investment. That is, unless you have the kind of money to pay for bespoke programming (for you alone) Let's say it take a day to make a good style. You got enough to pay someone a good day's wage for each style? I didn't think so

Personally, I think your best bet is to look into older styles, either from Korg or translations... ask around, see if someone will post a few examples. You may find them to be all you need. Thing is, tyou still need to play them on the latest, greatest, just for the sounds... A simple pattern, played through a far better drum kit and instrument sounds is going to sound better than the original... (hopefully! )

What are you using right now? It may be possible to translate those very styles over to Korg (or whatever you chose). There's a lot of options, Lucky.

Don't give up, yet
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An arranger is just a tool. What matters is what you build with it..!