It is very useful to be able to tag different locations in a session for later use when editing and mixing. Ardour supports both locations, which define specific positions in time, and ranges which define a start and end position in time.

In addition to the standard location markers, there are several more kinds of special markers:

• BBT markers make it possible to restart the count of bars and beats multiple times in a session.
• Time signature markers allow changing the time signature from e.g. 4/4 to 6/8 and then to 3/4 within the same composition.
• Tempo markers allow changing tempo within the same composition either abruptly or gradually.
• Range markers helps preserving selections (ranges) by storing them in the project and giving them telling names.
• The loop range defines the start and end points for Looping.
• The punch range defines the in and out points for punch recording.
• CD markers are locations that are restricted to legal CD sector boundaries. They can be used to add track index markers to compact disc images.
• Cue markers allow integrating elements of non-linear grid-based workflow into the linear timeline-based workflow by launching and stopping user-defined cues at particular points in time.