Well I'm fairly clueless to be honest but this is what I did, it's taken a while to work this out (really need to baby spoon me here):
1. New Project
2. Insert audio track
3. Arm and Record audio track (say 10 bars worth).
4. Insert a new tempo (let's just say 145) at bar 5
------- so far we have a project that is 120bpm through bar 5 where it then switches to 145bpm --------
5. Bring up automation for panning, volume or anything else
6. Set the draw tool to saw wave.
7) Set event draw duration to 1/4
8) Set snap to whole note.
9) Draw across the automation from bar 1 through bar 8 onwards....
I get the below image, note the leadup is a straight line, however I drew it from bar one and the line got created.... No idea....
Anyway here is the image, does this prove anything...?

What is missing from these steps otherwise?
(this is reminding me of
http://www.photoshoptroll.com/ 
, however it's real and I'm the stupid person )