After completing this task and returning to Solstheim, the Sallow Regent sound effects (endless crackling, static noise) won't turn off. I figured it was a glitch, so I went to a previous save and replayed the Black Book Sallow Regent task. Returned to Solstheim, still have the noise. Tried sleeping, fast travel, checking for active effects, etc., can't get rid of the noise. Frankly, it ruins the whole ambiance of the game. I'll have to restart from that previous save and skip this Black Book task, maybe do it last. Has anyone else run into this problem? Sallow Regent was my 3rd black book, don't know if sequence matters.