Keep in mind it's 95% synthesizer, 5% controller. So it's not going to do much with the USB beyond send notes and velocity.
What you'll have to do, if you want to access its filter, is get an actual sound output to run from you computer or other source to it, then run its output back to the computer. With that soundcard, you should be able to run out of, say, the Ch3 out, thru, then back in one of the inputs on the interface, and as long as you mute the monitor or can otherwise keep it from feedbacking, that should work great.
I use a Delta 1010 and run sounds out of it that I then record back to a separate track thru FX pedals and, more recently, the 'brute. You just have to remember that you have to trigger the keyboard to get the signal to go through, and that's as easy as laying something on it with the oscillator turned all the way down. There's a couple of tricks noted in other threads about other workarounds for getting the gate to stay open, too.
