Now that I purchased BIAB/RealBand as tools to help with my band/orchestral music composition and trumpet solo backing tracks, I'm trying to figure out what my best soundcard/interface option is.

I have been doing digital recording of my bands for many years (since the mid-nineties) and have a decent amount of gear. Among that is a M-Audio Fast Track Ultra interface, as well as a Zoom R24. However, these are both digital audio interfaces, so I can't imagine that they'd be helping me on the MIDI side of things-bouncing between my notation software and RB.

Would it make more sense to purchase an inexpensive Sound Blaster to use as my dedicated MIDI card, since it has on board soundfont support, etc.? I have found myself using a SB type card in the past for rough playback, even with expensive multi-channel interfaces.

Again, I'm looking at this from the MIDI side of things, not digital audio. Thanks in advance for your help!