Hi:
Variable-density was used to record sound into the those old B&W films
before variable-area was invented.
What characteristics in the film material itself [e.g. the chemicals
within the film, "grains", etc. etc.] determines the audio quality [e.g.
the bandwidth, dynamic range, SNR, clipping point, treble response, etc.
etc.] of a VD track?
Thanks,
Radium


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