one follow on to this (a year later)
I'm discovering that the mixer I'm using to send multitrack to only operates at 48k or 96k, so I'm setting Stage traxx to 48k rather than 44p1k and redoing all my multitrack to match... fortunately I'm new at stage traxx and have only made 20 songs so far.
Also, discovered that izotope Rx has a batch resample function, which makes this process a lot faster. All I really need to do is drop the files in the right folder and re-grab them in each song in stage traxx.