Hi Dievas,
I'm glad to answer your question.
I come from China, so I believe my answer should answer some of your doubts.
Electronic organ players in China usually don't use the voice files and style files of the official expansion package, because many voice parameters need to be adjusted.
Moreover, even if the parameters are set, the sound effect of real musical instruments cannot be simulated.
Therefore, the electronic organ in China is made of sampling data and voice files by adding playing effect and adding effector parameters.
In style files, drum files with extended voice files are usually used, which can prevent others from copying their own style files.
Of course, people who make expansion packages in China are selling expansion packages to make a living. They make expansion packages professionally.
Of course, if you need, I can provide many style files that are popular in China now, but these files may need to modify the voice file package and notes of the drum channel.
As a beginner of electronic organ, I can't modify the contents of style files. If you need, I can record some playing style files or some music played by electronic organ players to provide reference information.
If you need, I can post these files to GITHUB, because I'm not sure whether the network disks in China can be accessed normally abroad, and most of the network disks in China need to use their software to download files.
My English level is not very good, so I used Google Translation. Maybe the words translated in some places are not very clear, but I try my best to make the translated content more convenient for others to understand its practical meaning.
In fact, I can understand all the commonly used English words, but I can't organize them together. I'm so sorry.