Any recent MIDI keyboard has an USB connectivity option, so it's completely soundcard independent - you don't need a MIDI port in your computer anymore. Everything controlled by such keyboard should work on your Realtek chip as well - just install
universal ASIO driver on your computer for low latencies. Of course using proper soundcard (aka "soundinterface") with it's own ASIO drivers could bring you a bit better results like lower latencies, better signal to noise ratio and stuff.
I think I share Greg's view on Behringers stuff, it's pretty well known manufacturer of cheap and not very reliable stuff
