Change tempo without affecting tracks
Trying to figure out how to change the tempo of the song without affecting the previously recorded tracks. I have done a lot of searching and apparently in previous versions of GB there was a box you could uncheck in the editor called "follow pitch and tempo" but I can't find this box.
I recorded live instrument parts before setting the tempo and now I want to add software instruments but when I change the tempo, it speeds up the previously recorded parts.
GarageBand 10, OS X El Capitan (10.11.1)