Nick DiDia is the mixer of the DVD (5.1) audio. I suppose he mixed the stereo audio of the Unplugged tracks on the 10 From Ten sampler, too. And Brett Eliason mixed PJ20.
I wonder if Black is the only Unplugged track mixed by two differents persons. 'Cause I listened both versions, and they are little tiny bit different.
I don't know, maybe I'm wrong.