Speed Up The Tempo In an Audio -based project

I’m having difficulty with speeding up an entire song with multiple tracks. They’re a mix of audio and midi. I seem to be able to speed up some tracks while others remain at the same tempo. I’ve tried putting all the tracks in musical mode then changing the tempo track bpm . Is there an easy way to do this? Can anyone recommend a good tutorial that deals with this? I’m using Nuendo 3.