Hi Diki,
I have soundsets for Ketron & Yamaha. Admitedly they're only soundfonts, but I probably could get them to work reasonably well.

I don't think Dan is under any grand illusion that he's going to replace yamaha, roland & ketron keyboards with VArranger.
I tend to think is aim is to create something affordable for the average user. Someone for can't afford or doesn't want to spend the money on basically having to buy 3 seperate keyboards.

I came across VArranger when basically all it did was play Ketron styles. That was amazing in itself. I sold my SD1+ a couple or so years ago, & I thought it would be great to have access to my Ketron Styles again. As good as the SD1+ it's not, but that probably has more to do with the SD2 sound module I'm using rather than Dan's VArranger. One can't expect a cheap sound module to have the same quality of sound that a $5K arranger had, but I have access to Ketron styles again.
Short while later VArranger also played Yammie styles. For me not the be all and end all as I already own a Yammi PSR 1500 Keyboard plus I'd been a One Man Band software arranger user ( which also plays Yammie styles) for a number of years. Still great for users who don't have a Yammie product.

As I mentioned in my post, woke up a few days ago, and wow, I also now have access to my old Roland styles. Haven't owned a Roland keyboard since my VA7 back in about 2002, not likely to either.

So, have started out with a sofware arranger that played Ketron styles, it also now plays Yammie & Roland styles & hasn't cost me a cent extra from my initial investment. Dan does his upgrades for nothing, which to me & the rest of the VArranger community is pretty amazing.

BTW Happy Birthday Dan, (better late than never0 haahaa