Grid Units

The selector next to the grid mode selector defines the size of the grid elements. The most useful settings are "Bars" and "Beats", but you can set your grid to several different units.

Note:   to use Region starts/ends/syncs/bounds as snap choices, you must have either (a) NO tracks selected, which means that Ardour will snap to regions on any track, or (b) several tracks selected, and Ardour will only snap to regions on those selected tracks.   If you are moving items on a track, and only the current track is selected, then you will only be able to snap to other regions on the same track.  This means that the Option "Sync Track Selection to Region Selection" will make the "Region" grid units unusable.  Avoid the use of this option if you are going to use any of the Region grid units.