<para> 
This option causes all tracks to be appended to one another to form a single
track.  This option does not work if any two tracks overlap in time; in that
case, consider using the <option>merge</option> option. 
</para>
<para>
This option is most useful for rejoining tracks that might have
been interrupted by an equipment malfunction or an overnight stop.
</para>
<para>
If no other option is given to the track filter, this option is assumed.
</para>
