Draw tempo?

Open 'global parameters' track and select the tempo parameter. Use the drawing tools.

I believe you must doubleclick on tempo, but  i am lost too, terrible this yet. 

That's because it always shows Figure (no matter which parameter is selected for the inspector) unless you enable the "Link" over the parameter block. 

Thanks for bringing this up though. You remind me of the fact that this link mode switch is not immediately intuitive. It is enabled by default to minimize the chance of confusion, but as you just demonstrate, it is too easy to miss this detail and get confused.

Any suggestion how to improve this?

-A dedicated tempo editor 
-parameter view active :  (Parm) 

default it seems to be steps for parameter drawing 
In the past you could choose the line construction,but is was never like the same as in a DAW possible ?
Velocity fine drawing with roundings ( circle , parbolic shape ?) as seen  in Cubase seems to be als not possible 

It would make sense to have a separate Link button for each individual track. These buttons could then be placed at the track headers, alongside to the Solo, Mute and Pause buttons. And you should give it colors to make it more obvious, if it's activated or not.

What if the link was always enabled? Do away with the switch. You'd see immediately when the wrong parameter shows up and select the desired one. No guessing why something seems wrong.

In order to minimize mouse movement, the block could sort the most frequently used parameters first (or: a small block of aliases on top).

What if the link was always enabled? Do away with the switch. 

That would be ok for me. I find the option dispensable.

It would be more interesting to have the option of displaying different parameters for different tracks. Figure for one instrument and Step for another, for example. But that's another thing.