The first organ that the system has been used to emulate is the uterus, because keyhole surgery is widely employed to deal with ectopic pregnancies (those where the fetus develops in the fallopian tubes leading into the womb, rather than in the womb itself).
Yeah, it doesn't emulate a full surround sound system altogether that well -- the clue's in the "virtual" -- but it looks pretty good and is definitely compact, which is sort of the point with these kinds of devices.