Thanks Sir @Alfred.DeFlaminis ! 🙂
That is Ok, and encouraged! 🙂 🙂 🙂
Hi @Anonymous,
that is a great question! 🙂
There is no 'tools' to do so as far as I know of 😞
There may be scripts out there that are written to do so, I have not searched 😕
I've attached a video of what I know of and saying below, and that you may already know of.
When in Track view, right-click on a Key, a Property editor pops-up, and there is an 'advanced' button.
In which you can see the in and out tangent values.
These can be copied and pasted.
Not much fun to do but works.
If you 'know ahead' that you'd like to edit multiple tangents in the same manner; in the Trackview menus > Tangents > Lock tangents.
When the option is ON, selected keys tangents will move together. That is not setting the same absolute value, it applies the same offset move.
If you are into max scripting, you can access keys' tangents via maxscript.
I could explain how to if you are into scripting. Let me know if that is the direction you'd want to go.
This said, scripting will be a lot of work too! But valuable if you are in a production context and need to do this operation very often.
I hope this can help and answer your question! 🙂