HI!
I don't know if this is any help, but I too have the JV-1010 and agree with you that most of the sounds are fine. However, I also have the Yamaha SW1000XG soundcard and consider this to be far superior to the JV regarding drums. If you want to listen to brush swirls from the SW1K, go to www.peoplesound.com/artist/necessityandtheinventions
or www.necessityandtheinventions.iuma.com
and listen to/download the song No One Is a Fish.
The card is almost 2 years old, costs £350-400, but I reckon it's well worth it. Compared to the JV-1010 it's a marvel of user friendliness...
All the best,
Magnus