### withPosition

Adds the attributes required for the position to locate the track.

##### Attributes

###### `display-start?: number (default 1)`

Position on the sequence where the track should start rendering from.

###### `display-end?: number (default -1)`

Position on the sequence where the track should end its rendering. The default `-1` represents the end of the sequence.

###### `length?: number (default 0)`

Length of the sequence