Machinbird, my discussion was intended to be generic, analog or digital. Digital is a little more difficult to stabilize in a feedback loop than is analog if the digital sample rate is too low. If the digital sample rate is high enough very simple (short time constant) analog filtering preceding the digital sampling can give close enough to the same results as analog that distinguishing a difference is a futile. (... except, I might note, for the same people who think gold plated wall power sockets make their audio sound better for their hi-fi system.)