I have an audio track ( song with vocals ).  I want to make a new acc track for a choir
I have the audio track laid down      audio snap says it's 188 BPM...   yeah right...
More like 93-98...
I set my project tempo to 98.
I laid down a ref track using a Kick drum...  4/4 time.
when i listen to it it's right on ( the recorded song.. which does drift in tempo.. so I have to match the midi clock signal to be in time with the beat timing on the recording..   ( I plan on playing along until I pretty much have enough to ditch the backing track.
 
I select my ref track with the kick drum.
I hit process / Fit improvisation.
 
When I do this my audio track goes to pot and shrinks and the timing is.... well   totally screwed up to put it mildly.
 
What on earth am I missing here?  I've been at this for over a day.
 
I thought the temp would change with the song as it went along,  basically nudging up and down and the 4/4 beats the i laid down would end up being in measures of BPM to match the song.
 
Why can't it leave my audio track alone?
 
Obviously, I have not used sonar for anything too complicated.. yet...
 
Thanks for any help.
 
Wayne in Maryland

Several things:
 
1) Your audio track probably isn't shrinking. You check the actual run length of it to confirm this. The graphical representation of everything else on the time line and track view is probably expanding.
 
2) IIRC, The kick drum track (I assume it is MIDI) will not change in time when you "Fit to Improv", so if you want to end up with the audio scratch track and the MIDI kick drum track aligned you should make a duplicate "reference" MIDI kick drum track. The MIDI track that you don't run the "Fit to Improv" process on should remain aligned with your audio track while the "reference" MIDI track will be left to expand or contract with the graphics.
 
3) Abandon all hope thee who enters the world of "Fit to Improvisation". This is a feature that has aggravated users for two decades with it's quirky and expected but less than useful behavior.
 
4) Wonder why the popular video tutorialists confine themselves to producing dramatic readings of the owners manual? There's some stuff that just isn't very pretty when viewed in real life settings.
 
Good luck.
 
 

BINGO....  clone the reference (tap tempo) track 
mute ref. track..   cloned track worked like a champ
Thanks

If this thread is solved, I'd like to mark it as such. As Mike pointed out, people have problems with Fit to Improv but it seems the fix was fairly simple for you and that might help others.

Yes,  for now I'm great so you can close it.  Thanks for the help.

Not that I did anything to help...but I'll reflect the thanks to Mike.