WHAT DOES LED ZEPPELIN GOLD RECORDS MEAN?

Now that you just mention it, the main 2 tracks seem to deficiency low bass, (besides a bass drum strike just prior to the fade away from Custard Pie). But then “In My Time of Dying” appears to have some extra bass… unsure what was going on below, in all probability recorded in drips & drabs in numerous areas, although the mid-variety is kind