How to change the tempo of individual music?

Since you are timestretching, and not changing the tempo as such, you’ll have to calculate the tempo value yourself. (But does Cubase actually know the tempo of the original clip?)

I’ll try to explain…

It is not a specific “time”, something generic to base myself, same as the TEMPO TRACK when you change aparare a time base

To help me understand - you want to stretch some but not all tracks in a project? If so, won’t they be out of sync with the rest of the project?

Thanks for clarifying.