Tempo changes using VSTs

I’m having a horrible time with this. I am making a mock up of an orchestral piece using VST orchestra tracks. After completing my mock up I tried to import an audio file of the same piece played by a real orchestra so I could match the tempo nuances. I did a Tempo Detect for the audio file, but I don’t know how to get the VST tracks to change to the new tempi. I clicked the linear/musical switch but nothing changed. Anyone have an answer?