Hi. I did a boo boo....
I imported 110 tempo WAV files into a 120 tempo template in Cakewalk.
Recorded whole bunch of vocal takes, but realized that project is 120... I need it to be 110... If I just change the tempo, all "loose" takes (over 100) will shift in undesired way. Is there a smart way to change tempo? Everything is audio, no midi.
 
P.S. I assume that actual audio tempo  is 110, but sits on 120 grid.
Please let me know.
 
Thank you,
Misha.

There are a lot of ways to skin this particular cat. I think the easiest solution would be just to ignore the tempo, and keep on recording...unless you have MIDI instruments or effects that absolutely need to sync to tempo. If so, there are other options that are a little more complex.
 
Craig

Snap the Now time at 121:01:000. Hit Shift+M for Set Measure Beat at Now, and set Measure 111, Beat 1. The initial tempo will change to 110 without affecting the absolute timing of any clips. Clips will appear to get shorter because the M:B:T scale is the fixed reference in CbB.

brundlefly
Snap the Now time at 121:01:000. Hit Shift+M for Set Measure Beat at Now, and set Measure 111, Beat 1. The initial tempo will change to 110 without affecting the absolute timing of any clips. Clips will appear to get shorter because the M:B:T scale is the fixed reference in CbB.

Can you explain exactly what's happening in your explanation? I'm interested, but I don't follow.

Craig, Thank you. you are right, I would usually just continue, but I have to share this project, I want it to have correct numbers.
 
brundlefly  Yes, that worked! Thank you! 
As Larry, I am a bit confused by the math here...  Is there particular equation for changing tempo in this manner?
I do not want to experiment, as I have a lot of things going in that project...
 
P.S. I wish there would be something automated, so this process is simplified by just typing in desired tempo.
 
Thank you,
Misha. 

It's all about ratios of beats per minute. You want 110 beats to go by in the same time (one minute) that 120 beats are currently going by. But that's the same as 110 measures going by in the time of 120 measure (regardless of time signature), and it's easier to snap some number of measures without having to do unnecessary beats/measure math.
 
The +1 measure comes in because measures are are counted from 1, not zero. So when 120 measures have gone by, the Now time is at 121:01, and you want the absolute time at that point to fall on 111:01.
 
So the general rule for any tempo change is to 'Set' the measure at Current Tempo + 1 to Target Tempo + 1.
 
Note that this works for MIDI as well; the MIDI start times and durations will be recalculated to maintain their absolute timing against the new timeline tempo.

bluebeat1313
P.S. I wish there would be something automated, so this process is simplified by just typing in desired tempo.

For audio, you can simplify it to 'just change the tempo' by setting the Timebase for all clips to 'Absolute' in clip properties. This causes the start times of clips to retain their absolute timing when the timeline tempo is changed, and they retain their absolute durations by default so everything will stay in sync at the recorded tempo. But you can't set MIDI clips to retain the absolute duration (only start times), so you must use the other method if there's any MIDI in the project that's in sync with the audio but not with the timeline.
 
Ultimately, I think it's easier to just use the SMBAN technique for everything, rather than messing with clip timebases.

+1, Set Measure/Beat at Now is one of the most useful tempo mapping tools there is (manual, but quick), and one of my biggest gripes with other DAWs, since few have anything even close.
 
When working with SM/BAN, due to the "Absolute" issue, it helps me to think of it like a vise (needing a start anchor and end anchor) to "squish" everything proportionally inside of those boundaries. When just changing the start tempo, things start to scoot on you.

brundlefly, thank you for explanation!
This is a very important post, I hope it stays in my "post history" when new forum is introduced. This has to settle right in my head :)
 
One  last thing please. This round, the whole song was less than 120 Measures so when I went to  121:01 the whole thing was to the left ...  if next time I have to correct tempo assuming similar 120->110 but song would be longer, lets say 140 measures,  I would still go to  121:01 ?
 
Thank you.

I really like brundlefly's solution.  I think I got how it worked, curious to see if I could apply that to other situations,
 
What I would have done is locked all the audio into place, making sure all the tracks were in"absolute" mode and not musical.  If I'm not mistaken you can select all the tracks then contrl-alt and change all the tracks at once,  then you can change the tempo at will.
 
This forum is so cool for learning things.