Screenshot of the "It's Secure" clip in Audacity and the same after a karaoke filter
The blank parts mark where I was only using the mono mix.
This is also just a draft, and I may do additional work. During at least one of the Beru lines I actually added the music back in underneath from the OST then cropped around the voice, so it actually never goes mono. This is the trick I prefer, but I don't know enough about the OST to do this.
Keep in mind that the Spanish mix is 2.0, it's not mono, although it has all the mono elements.
My current priority of tracks is this:
1. Spanish 2.0 from GOUT (main source)
2. English 1993 from GOUT (for most dialogue; note that this will inherently synch with the Spanish 2.0)
3. English 2004 2.0 (for "Close the blast doors" and the 3PO line - unless you know any other monoisms?)
4. Story of Star Wars (one Beru line and some of the loudspeaker voices)
5. English 1.0 from ITV VHS rip (last resort)
This is more of a proof of concept than anything else.