MIDI Timing

I recently started work on a new track with a friend.
 
The track is piano driven with a lot of ritards in transitions mid song. 
 
We have recorded the piano part only so far, but given the nature of the song we didn't use a click track.
It was recorded as midi (not audio) but when we come to add more parts (e.g. BFD) it would be useful if the timing was in sync.
 
So... what's the best way of sync'ing the project timing to the midi?
I've had a dabble with audiosnap but it failed with several warnings about the transients.
 
~ Tony

You need to use - Process>Fit Improvisation which requires you to record a midi tap tempo count with say a midi hi-hat (or other instrument) on a new track. Record a four count per bar track, playing along with your piano track for the entire song. Once finished, you have to then make sure that you have your first count as the start of the project (bar one, first beat) to keep it all in sync. With that track highlighted, go to Fit improvisation and it will sync your piano track with your count by adjusting the tempo. Remember to delete or mute the count track when you are done.
Pete

That's exactly what 'Fit Improvisation' does. All you are doing is giving Sonar a reference as to where to place the bars. You can also change the time signatures, if needed, once the bars have been set down. It will not change the timing of the piano track, it adjusts the tempo which will be always changing to keep up with the piano track.
Pete.

If it's all about getting a MIDI drum track down then bounce the MIDI tracks to audio to lock in the performance and then follow the Fit to improvisation procedure.

Ta daaa!