I like this article, it asks an interesting question (albeit I think it is the wrong question but still it is an interesting one) about how accurately linear sy

I like this article, it asks an interesting question (albeit I think it is the wrong question but still it is an interesting one) about how accurately linear systems can be approximated by discrete systems. If you get into digital signal processing (DSP) either through audio/synth stuff or software defined radio or some other way, the trade-offs and how discrete mathematics differs from continuous mathematics are a very deep topic. If I understand the current papers on quantum mechanics it seems that physicists are thinking more and more of reality in discrete terms rather than continuous terms. All of which is fascinating, and yet the first question here for audio stuff should be; What is the absolute best capability of the human ear to relative to its frequency response and dynamic range? If you have an answer for that, then when your digital emulation has as good or better frequency response and dynamic range as the best ever measured human ear? Well that would be, by definition, indistinguishable from an analog counter part. (and yes, you can consider infra-sound, ultrasound, and blood bone harmonic resonance and all the other things the 'oxygen free' cable crowd sells you on :-)).