- <li><dfn>Internal/MTC</dfn> defines if the current timecode is handled by Ardour, or by an external Midi device (see <a href="/synchronization/timecode-generators-and-slaves/">Timecode Generators and Slaves</a>).</li>
- <li><dfn>Follow Edits</dfn> is a toggle switch that defines if the playhead is moved when using the Grab Mode or the Range Mode tools, i.e. if any action on the canvas moves the playhead along.</li>
- <li><dfn>Auto Return</dfn> is a toggle switch too. When active, pressing the Stop button returns the playhead to its previous position, and when inactive, pressing Stop keeps the playhead at its current location. Activating Auto Return can be usefull for earing back the same part of the audio before and after having tweaked it, without having to loop on it.</li>
+ <li>The positional sync button (which might show <dfn>Internal</dfn>,
+ or <dfn>MTC</dfn> or several other values) can be used to control
+ whether or not the current timecode is handled by Ardour, or by an
+ external positional synchronization source, such as MIDI Time Code (MTC),
+ Linear Time Code (LTC) or JACK. (see <a href="/synchronization/timecode-generators-and-slaves/">Timecode Generators and Slaves</a>).</li>
+ <li><dfn>Follow Edits</dfn> is a toggle that can be used to control
+ whether or not making a selection (range or object) will move the playhead to the
+ start of the selection.</li>
+ <li><dfn>Auto Return</dfn> is a toggle switch too. When active, pressing the Stop button returns the playhead to its previous position, and when inactive, pressing Stop keeps the playhead at its current location. Activating Auto Return can be useful for earing back the same part of the audio before and after having tweaked it, without having to loop on it.</li>