IIRC it involved locking midi clips to a realtime time base instead of MBT. That's what I was trying to do yesterday....obviously with no luck
There was another thread about this yesterday. Page 295 of the 8.0 Reference Guide says that should work as well, but it never has. I wish it would, because otherwise, there's no facility for deleting or changing existing tempo entries,
and having MIDI stay put in absolute time.
For reference, Set Measure/Beat At Now just aligns the musical time you specify with the absolute time at the Now cursor by altering the mos recent tempo to make that number of measures fit in that amount of time. It will adjust this relationship between musical time and absolute even in a blank project with no audio or MIDI in it.
In 8.3.1 and earlier, it also placed an equivalent tempo at that absolute Now time, which would correspond with the new musical time after the preceding tempo was changed. This is so you can then snap another point later on, and the tempo at the most recently "Set" position will be adjusted adjusted, rather than the earlier one that was already adjusted.
The 8.5.3 patch broke this model in that it inserts the new tempo at the musical
time where the Now cursor was before
the tempo change, and this ends up being a different absolute time. This isn;t big problem if you're going to snap and entire piece to one tempo, but if you want to go back and snap addiitonal points, things can get ugly in 8.5.3.
Since your signature indicates you are on 8.3.1 you'll be okay either way. but be aware that the funcitonality will change if you upgrade to 8.5.3.
I'm crossing my fingers for an 8.5.4 patch that fixes this.