From the user manual:
You can remove all time codes by tapping on the navigation bar button Remove Time Code Button and selecting Clear Timecode.
When you download time coded lyrics, it might be necessary to adjust the timing of all lyrics by a certain amount. You can do this by adding the following line anywhere in your lyrics:
[offset:10000]
The offset command will tell Stage Traxx to add the specified number of milliseconds to every timestamp in your lyrics during playback. In the above example 10 seconds will be added to every timestamp. You can also subtract time by specifying a negative amount:
[offset:-10000]
The above command will subtract 10 seconds form every timestamp.