Hi Bud,

If you uncheck "Enable RealDrums" in RealDrums Settings, you'll automatically get MIDI drums for every song.

You could use either an audio interface that supports direct monitoring, or a mixer (like John mentioned) to merge the signals from the soundcard and the SD2 and send them to the amp together. Then you could use any combination of MIDI and RealTracks/RealDrums, and hear it all through the same speakers.

Thanks
Kent
PG Music