Fit improvisation

From the documentation:

To use this command, you must record a reference track containing a single clip that matches your original track or tracks but has only a single note on each beat boundary. You should make sure that the reference track has one event for every single beat, with no extra beats or missing beats. The first beat of the reference track should be at 1:01:000. You can use any editing command to adjust the reference track.

In other words, this command should be applied to specially constructed MIDI track to extract proper tempo. And not on "real performance" (like several MIDI notes).

Off the wall idea that may be more flexible. I am not suggesting this as a work around but as an alternative method that may be worse or better depending on the objective.

Bounce to audio and use melodyne to extract a tempo map???

penryn
Hmm, I don't understand this function, because it does not work here, or I make an mistake.
How find professionals out the right tempo of recorded MIDI notes? I can remember, that old Cakewalk versions had an tap button, to tap the clock in. Than Cakewalk set the right tempo. How does it works with SONAR Platinum?

As I understand it from help file:
a) you need to create a tap tempo track as midi - that covert the full time range you are about to get a new tempo map for.
 
Description in help sounds really cumbersome to me.
What I would do is duplicate your midi clips involved to a reference track, just any other midi track.
Then glue them together with Bounce to clips thingy - to get a single clip covering time range.
Then remove any midi controllers and non-quarternote notes - it's how they describe it - no interfering events other than tap tempo, no controller or anything on reference track.
 
Then do Fit improvisation on that tap tempo track - and the tempo map when activated should align with your free recorded improvisation.
 
But depending on content you could choose to activate recording on a reference midi track - and do manual tap to what is played on your free improvisation. Then maybe adjust having these two tracks next to each other - and see which note on tap tempo should align with what you played.
 
Or just use the Set measure/beat at Now function as described to go through what you played. If a shorter part this may be the simplest way.
 
What daw needs to do is actually stretching the midi content assuming the current tempo of project and stretch midi and also insert new tempo so live performance is sounding the same but now aligns with new tempo grid. So stretching midi involves changing positon and length of all midi events.
 
But if this also incorporates meter changes is not that easy thing to do. If there is an overall feel other than 4/4 meter I would set that first maybe.
 
Since reference midi track with tap tempo single clip is where Fit Improvisation gets input - experiment with just a short bit that involved two tempo changes or so first. Then delete that tempo map so you only get project tempo again - then do the final version covering it all.

When you use a Audio file and want to get the right tempo, I think you have to use the AudioSnap tool. Than you get a virtual tempo map. I believe Fit improvisation you use it for real MIDI files, not for Audio files, isn't so?!