Yeah, I don't know how that'll be possible. I don't know how one converts laserdiscs to DVD, but taking the dialogue from a laserdisc source with surround sound channels might be the only way. Still, Vader's breathing might still be there in that center channel where they tend to place all the dialogue in these mixes. Either that, or maybe someone with Pro Tools can labor over it to try to isolate Wingreen's voice.

Of course, you could ask Adywan since he's reinstating Wingreen's voice into ESB:R, but I don't know how he's going about doing that.

-NJM