Cubase Elements 8 Audio track tempo

Hi all - Newbie here!

I have a project with audio tracks recorded independently of the Cubase tempo. I want to add drum track to it but in order to do that I need to change the project tempo to match the freely recorded one. Doing this in the transport panel screws up my audio tracks. Other posts mention toggling between linear or musical timebase but I can’t see this option in Cubase Elements 8. Am I missing something? Is there a way to record a track with a different tempo?

Any help appreciated!