yea except like I said in in one my earlier posts..if you had this tempo buffer automatic tempo feature at all...its not that you want to lock a "tempo point" to anything per say, ..but rather a SMPTE frame needs to be locked to the beat grid. And in my view it doesn't have to even be locked to one specific bar/beat position, it just needs to automatically snap to a beat....adjusting tempos (and optionally the number of beats through meter change) in order to keep it locked to a beat.
The tempo points should not lock to SMPTE, they are a musical expression. they should be be on the musical grid always. But its a question of how to lock the musical grid to the SMPTE so that the tempo changes will end up being in the right place...
That is essentially what the beat mapping tool does, but it works in a way that kind of makes more sense when you're just trying to get a tempo map that matches what a real drummer was playing, etc. it kinda works beat to beat...rather then over a longer period of time...it sorta works.. I messed with it for this purpose and got some good results sometimes, but not always because it would not be a stable enough tempo over longer period, it is going to make a tempo change every beat if necessary, the assumption being that the tempo changes will be slight, and mainly serve to re-align the bar/beat lines to the actual recorded performance.
but anyway that is what that does in way, you lock the beat grid points to recorded midi or audio. The tempo gets calculated, and LogicPro does work out that tempo buffer you speak of.
For film scoring, Its slightly different because you need a more stable tempo that doesn't change every beat. But you just need to make sure that certain SMPTE hit points land on beats...they are usually not that close together.
I think my dream feature here would be something where I can label a certain locked scene marker as need to be locked not only to SMPTE, but also "snapped" to the grid.
So essentially Logic Pro would adjust tempos and meters...or provide some direction to me for choosing on the fly how to handle it...such that anytime I made a change earlier in the cue...that SMPTE point would know that that musical grid needs to snap to it so that with a tempo change and meter change...that SMPTE point will land on a beat again.
If LogicPro could do that it would save film score composers hours of time. To be fair, no other DAW does this either...but we can dream right?
Obviously you'd want options...like maybe you don't want to allow beats to be added/removed...then the tempo changes would be more drastic to keep the SMPTE point snapped to a musical grid line. etc.. but it could definitely be done....
But anyway like I said..the point is...its not about locking a tempo point to video alone. You have to lock the musical grid to a SMPTE point...and the tempo changes will need to be musically sensible on the musical grid always.
OSX 10.15 (Catalina) on OpenCore - Logic Pro 10.6.1, VePro7, Mainstage3
5,1 MacPro 3.46ghz x 12 96gb ram