Vol IV No 6

I now believe it may be possible to ascertain the digital/non-digital status of vinyl records with nothing more than a jeweller's loupe.  Obtain several vinyl records which you know are digitally processed and several you know are all-analog.  Use the loupe to examine the grooves closely at varying points on each record.  You should note that the digitalized record grooves will be very, very smooth, while the all-analog grooves will have all sorts of ripples, which correspond to (infinite) audio detail.  (The digital grooves are smooth because of filtering which conceals the sampling frequency.)