I am confused by the question. If oyu use Real band to create songs that play back midi events through some specific keyboard, they will sound the same every time because it is that keyboard generating the sound. If you use the prerecorded snippets of music that are Real Tracks, you get what guitar and amp Brent Mason was playing when they sampled him.

Not following here....

Midi is data, audio is sound. Midi note events play back on whatever device is listening on the channel.