These cassettes derive from the attics of Earthshaker records.
Or more exactly from Alex T., quite a meaningful person when it comes to German Heavy Metal.
He was behind Mausoleum and Earthshaker Records and sold everything he had years ago.
These cassettes were used for the pre production of the final record on Vinyl. The producers tried out different mixes of the songs. As you can see on the notes, some of the mixes were too slow or too fast.
Some of the tapes are mixed with pre productions of others bands such as Brainfever or the german Mad Butcher.