Converting Audio From 24 fps to 29.97

Question

Hello All,
Background:
Transferred 16mm mag tracks (24 fps) to avi format.
Transferred a 3/4" video tape with image and audio which I believe is 29.97 fps.
Using Audition I Mixed the 16mm tracks at 48000 Hz.
Extracted the 29.97 fps sound track from the 3/4" tape transfer.
This is from the 1980's, so no time clock, no time code
It's an hour film, but I can easily separate the sound track for 30 minutes each
Both sound tracks are the same, however when I try syncing they drift obviously.
I need to swap out the sound track that is on the 3/4 inch transfer and insert the 16mm mag track mix, so the final result would be the image is from the 3/4" and the sound is from the 16mm mag track mix
Is there any way I can adjust my audio to get these two to match
Thanks

Answer 1

Bob Howes wrote:
It might be worth an attempt at the sync/stretch method Richard Knight suggests but I wouldn't be too hopeful.  My memories of 16mm mag players is that the multiple machines would be synced to each other (and a projector/viewer of some kind) but, other than their own little world, the speed could drift horribly--and not consistently.
Bob - I'm rather new to premiere and audition and I've been working with the different tracks to see if I could possibly find sync points and yes there are, but the sync/stretch method is a challenge but quite possible a solution. I think it can be done with alot of grunt work and watching tutorials from both adobe and lynda.com. Plural Eyes would make it so easy but the question is how to make the U-matic the master and the 16mm to conform.
However, as implied before, the 24/29.97 issue probably doesn't have any significance at this stage.  They refer to how the film is projected/video is scanned (don't get me started on telecine projectors with five bladed shutters!) but whatever the scan rate the audio SOUNDS the same speed.  It's sort of like taking a reel to reel tape at 15ips and dubbing it to 7.5ips.  Even though the absolute speed has changed, the length of the playback stays the same.  I strongly suspect this is all just a matter of old 16mm and U-matic stuff not being locked to anything in particular and drifting like mad in terms of speed.
Bob I believe you're correct, and oh what times these are for analog lost in the future  - a brave new world. It will be done.... somehow ;-)
Thanks again all - This will go either very fast or very slow