Now which you mention it, the first two tracks seem to absence very low bass, (besides a bass drum strike just before the fade from Custard Pie). But then “In My Time of Dying” appears to have some extra bass… unsure what was occurring here, most likely recorded in https://ledzeppelingoldrecordawar80099.shotblogs.com/the-fact-about-led-zeppelin-gold-records-that-no-one-is-suggesting-40651034