This is for controlling the position in the stream/file of a playback device 

 | Data byte | Description                                                                                                                                                                                         | 
 | :---------: | -----------                                                                                                                                                                                         | 
 | 0         | Reserved                                                                                                                                                                                            | 
 | 1         | Zone for which event applies to (0-255). 255 is all zones.                                                                                                                                          | 
 | 2         | Sub-zone for which event applies to (0-255). 255 is all sub-zones.                                                                                                                                  | 
 | 3-7       | Position in milliseconds, This is an integer with a size specified by the event size. This 0xFF, 0xFFFF, 0xFFFFFF, 0xFFFFFFFF and 0xFFFFFFFFFF is the maximum that can be sent for different sizes. | 
