Hi Doc,
unfortunately as far as I'm aware it's load one style at a time, I'm pretty certain that you can't play the style via the card, though I must admit I haven't used it for a while.
Most of the time I had mine midied to a laptop and used OMB to play the styles. Works quite well if having it midied up is an option for you?

I'm not a performer, so loading single styles was never a hassle for me.

best wishes
Rikki