Kiplis Thank you! Currently Live Preview can be only accessible through a site. If you have a local STY file that you want to play through the preview feel free to upload it to the site so others can enjoy it as well (that's the whole idea).
Can you describe how do you use the Live Preview? I assume you have some Yamaha keyboard if you can hear these voices and sysex commands, but probably something that's not an arranger, like MODX?
Live Preview would be a great feature that could potentially open styles for non-arranger keyboards, but I feel I bite off more than I can chew there, it is too complex and it will require a lot of additional effort to get it right, currently it's in a state of a barely working prototype. To be honest I am not planning to continue working on it anytime soon, there is a bigger fish to fry currently. For arranger keyboards it is not accurate enough to be useful, and for non-arranger keyboards there is too little demand to justify the large time investment.