Time, Tempo, and Meter : Identify Beat Command : Dragging Bar|Beat Markers
 
Dragging Bar|Beat Markers
Bar|Beat Markers can be dragged to new locations so they can align with audio clips that have been moved, or so that they can align to a slightly different point within an audio clip. This results in neighboring MIDI data being adjusted to align with the new tempo map.
Because Bar|Beat Markers are sample-based and tempo events are tick-based, they behave differently when you drag them in the Tempo ruler.
When dragging a Bar|Beat Marker:
Its BPM value is recalculated along with the Bar|Beat Marker to its immediate left. Bar|Beat Markers to the right of the dragged marker remain unchanged.
Its bar and beat location is dragged with the Bar|Beat Marker. If the Bar|Beat Marker was originally placed at 3|1|000, it remains there (unless it is edited).
Its sample and SMPTE locations change, as calculated for by the new tempo for the Bar|Beat Marker.
Neighboring MIDI events, along with the Bars|Beats ruler, shrink or expand as necessary to adjust for the new tempo.
When dragging a tempo event:
The tempo event is placed at a new bar and beat location. The sample and SMPTE locations for the event are updated as well.
The BPM value for the dragged tempo event remains constant, as do any other tempo events in the project.
Neighboring MIDI events and audio clips on tick-based tracks, along with the ruler, shrink or expand as necessary to adjust for the new tempo location.