If you turn off musical mode on the audio files, and change the project tempo, the audio usually does nothing, but stay exactly where it is, while not being stretched or pitched.
Just to let you know, I dropped out of the discussion because I have no idea what you can/can’t do in the version you have. However, if you have an audio pool and set the clip to time linear it should not stretch.
I think, there is an echo in here…
Only between your ears. 