Please stop confusing the people. 
There are two terms:
-
Musical Mode - Turn it on for an audio file in the Info Line or in the Pool and that file will change speed with the project tempo.
-
Time Base - this is a track setting, regardless of the type of content the track contains. Its icon is in the track header: a quarter note for Musical Time Base, or a little clock for Time Linear Time Base.
- A track set to Linear time Base will have the start times of all its events locked to Seconds or Timecode position; if you change the tempo the event start times remain the same.
- A track set to Musical Time Base will have the start times of all events locked to the bar and beat; if you change the tempo the event start times in minutes:seconds will change, but of course, the starting beat/bar remains the same.
A track can be set to Musical Time Base and have audio files on it that have Musical Mode either on or off, and vice-versa.
Use the right term please! It’s confusing enough for new users since the two features have such similar names.