Bars:Beats
BBT markers allow resetting the timeline to a particular bar and beat. Most of the time a BBT marker will reset it to 1|1|0 (the very first beat of the very first bar) so that for each song in a multi-song session there would be a musical time origin. However it's entirely possible to reset to an arbitrary value such as 7|3|0.
To create a new BBT marker, -click on the Bars:Beats ruler. This will open a dialog titled New Music Time where you can name the marker and define what bar (left field) and beat (right field) this marker should reset the time to.
![New Music Time dialog](/images/new-music-time.png)
The timeline grid and the ruler will be updated accordingly:
![The BBT marker resets the musical time](/images/bbt-marker-resets-musical-time.png)
Dragging a BBT marker right or left will reset the musical time at a different position on the timeline.
Right-clicking on a BBT marker opens a menu with two options: Edit… and Remove.
Choosing Edit… opens the Edit Musical Time dialog where it's possible to rename the marker and set a different bar and/or beat to reset the musical time to:
![Edit Musical Time](/images/edit-bbt-marker.png)
Choosing Remove deletes the marker.