He use to place a tape recorder ( the old school black box kind ) in front of his amp so that is why you can't hear much else. they were for his reference of his performance which i'm not sure he ever used. after his death they were slowly leaked out in the form of bootlegs
@robertruizjr100 you're correct there sir / my vinyl is actually in storage at the moment so i was quoting from memory which apparently isn't so great