The Bactra Review   Brainchildren
This last, as Dennett correctly says, makes the relationship between the virtual Joycean/Jamesian machine and whatever it's implemented on non-trivial, since it needs the correct sort of low-level noise to produce the right kinds of variations. It is, incidentally, perfectly licit for algorithms to invoke noise and randomness of specified sorts. For the details which make this mathematically respectable, consult any good book on stochastic processes.