Now that you choose to point out it, the first 2 tracks seem to deficiency minimal bass, (besides a bass drum hit just before the fade out of Custard Pie). But then “In My Time of Dying” appears to have some extra bass… not sure what was occurring below, https://jeffreyslfxl.blogs100.com/27161724/not-known-factual-statements-about-led-zeppelin-gold-records