This is interesting...

The PITCH of the commentary on the Blu-ray is 4% lower than the pitch on the Laserdisc, which I take to mean that the Laserdisc commentary was originally PAL. But the quiet soundtrack underneath the two commentaries is the same pitch, meaning it was mixed in later.

So, what to do? I believe the Blu-ray pitch is probably correct. I may try to just pitch-correct the bits of dialogue that are missing from the Blu Ray (from around the video edit) and merge them into the Blu-ray commentary. It's just a commentary track so I can live with that. Other suggestions welcome.

EDIT: Nevermind, the Criterion commentary covers the Anthrax extension so I'd have to edit it anyway. So basically unless I hear otherwise I'm merging the Blu Ray two-channel mono track back down to proper single-channel mono, pasting over the transition around the cut, and leaving it lossy (no Laserdisc material used). Japanese track, here I come...