Had a short cut to it and now I can't find it...

You need to use - Process>Fit Improvisation.

Project > Insert Tempo Change brings up the dialog. Create the keyboard shortcut of your choice.

Or download Drummer's Metronome for your smartphone :O) After I got it, I stopped worrying about trying to click a mouse in time. Seriously - a great app (free).

scook
Project > Insert Tempo Change brings up the dialog. Create the keyboard shortcut of your choice.

 
Scook is always on it... here is another way.
 
Click Views > Tempo
 
In this view at the top there is a tool bar with 4 icons... +, -, and two others. the one on the right is Tempo List. Make sure the Tempo List is displayed by clicking the button (it appears on the right).
 
Now, Click the + button (a dialog will open) and tap your tempo.
 
Kinda convoluted but it works. You have to hit the start playback button before you hit the plus if you want to hear the playback while you tap.
 

I've never used that mouse driven option myself. I find it easier to input a 4 beat click to the song via my midi keyboard then do a Fit Improvisation.

petgod1
I've never used that mouse driven option myself. I find it easier to input a 4 beat click to the song via my midi keyboard then do a Fit Improvisation.

 
I think the point is to set a new project's tempo by feel before anything is recorded.
 
But while we're discussing options, here's my preferred alternative to tapping:
 
- Disable Stop at Project End in Track View Options if it isn't already so you can run the transport in an empty project.
- Start playback with no click sounding, count off a couple-few measures in your head, and stop the transport on the next downbeat.
- Shift+M to open Set Measure/Beat At Now, and enter that measure and beat.
- SONAR will set the tempo to make the specified beat fall on the absolute Now time where you stopped the transport.
 
This gives very accurate results in a new project with low latency where the transport start/stop is almost instantaneous. Note that SONAr will also insert a matching tempo at the beat you set. It won't matter unless you go changing tempos later, but you can delete it if necessary.
 
This works especially well when setting a tempo for someone else. You can just ask them to count or beat a tempo and start/stop the transport on their count.

Though unofficial, Duckbar has a handy tap-tempo tool in its toolbar.

@brundlefly ... thanks for the tip, I'm definitely going to try that. I've always had trouble getting good results using the mouse to tap the tempo.

I like that, Brundlefly. Nice one!