Hi Again Dave,
I have a not much used Studio 10 and I dont have True widescreen material but I will get some to see if it differs from S9 with respect to combining different aspect material
To answer your query directly ( I did try in one of the post above,) Pinnacle Studio 9
cannot accept both 16: 9 and 4:3 aspect footage in the same project and Im pretty certain the software cannot "change" the aspect. Maybe someone out there knows of a workaround Pinnacle isnt telling us
It usually sets the aspect based on the first footage captured. You can view the footage in whichever aspect you wish but it does not affect the actual footage itself.
PS: Ive now had a play with S10 and some widescreen material made on my camcorder in " cinema" widescreen mode ( pseudo 16:9)
S10 will not allow capture of both types of aspect in one capture session. Unlike S9 though, It
will allow a mix of both aspect in the same project but during rendering will commit to only one format for output , So it will "change" the aspect of one or the other for output depending on what was chosen at the initial template format for the project.
Im not advocating that you run to the shops to get S10 but it is better than S9 in that regard. I am keeping my S9+ ( alongside 10+) until Im confident 10 is not a glorified beta release

Ill probably remove S9 soon!
good luck with your "project"!

PS: In S9 you could capture and edit the aspects separately, out put as avi or DVD mpegs2 and see if a dvd authoring program like ulead mf4 or even nero vision will accept them on the same DVD