jay z*If you believe Chauncey Mahan, he was the one who created the sound people know and love from Roc-a-Fella Records in the late ‘90’s and early ‘00’s.

In a new lawsuit obtained by TMZ.com, the sound engineer claims he was one of the first masters of Pro Tools production software and was instrumental in creating the sound for a number of Roc-A-Fella’s biggest releases between 1999 and 2000, including Jay Z’s “Vol. 3…Life and Times of S. Carter” and “The Dynasty: Roc La Familia.”

The new suit is the latest surrounding Mahan’s battle with the Jay Z and the Roc. Earlier this year, the rap mogul and Roc Nation filed an extortion police report that claimed Mahan was holding boxes of master recordings hostage and demanded $100,000 for the music.

TMZ reports that Jay Z set up a sting operation where his people met Mahan at a storage facility in the San Fernando Valley. The set up proved to be a success as the LAPD was on the scene and seized the boxes, which the still have in their possession. As it turned out, Jay Z and Roc Nation dropped their extortion complaint against Chauncey, TMZ noted.

In regard to the new lawsuit, Mahan is asking a judge to say he was so essential to the creation of the music that he should be labeled as a co-owner of the copyright. If everything works in Mahan’s favor, the judge’s ruling would give him the right to get the masters back.