These are audio drum styles that replace the MIDI Drum track with actual recordings of top studio Jazz/Rock/Country drummers! These are not "samples" of single drum hits; they are full recordings, lasting from 1 to 8 bars, playing along in perfect sync with the other Band-in-a-Box, RealBand, and PowerTracks Pro Audio tracks.
For example, choose a brushes style and you will now hear lush Jazz brushes, exactly as you'd hear if the drummer was in the room with you. The results are dramatically better than MIDI. They sound like a real drummer, because they are recordings of a real drummer. And adding a real instrument to the mix makes all of the Band-in-a-Box parts sound more authentic. In PowerTracks, add a RealDrums track to an old recording, and it will play in perfect sync with the original file.
As well as improved drum sounds, you are hearing the exact rhythms played by the drummer, including features not seen in MIDI (subtle drum rolls, variations in ride cymbal taps, complex fills, etc.). A "RealDrums" dialog allows you to set whether you want to hear RealDrums with all styles, no styles, or somewhere in between.