Jay Z

A sound engineer — who says he worked with Jay Z and Roc-A-Fella in the late 1990s and early 2000s — claims he’s owns as many as six albums from the label.

According to TMZ.com, Chauncey Mahan has filed a lawsuit, claiming to be instrumental in creating the sound for a number of Roc-A-Fella’s biggest releases, including The Life and Times of S. Carter and The Dynasty album.

In April, Mahan made headlines when he allegedly tried to extort Jay’s Roc Nation for masters dating back to 1998 — including hits like “Big Pimpin” and “I Just Wanna Love U (Give It 2 Me).”

An investigation was eventually dropped.

Now, Mahan wants a judge to rule that he’s a co-owner of the music’s copyright… giving him the ability to get the masters back… which the LAPD currently have possession of until a judge decides who the rightful owner is.