This is typically for adjusting the treble level settings of a sound device. Depending on the implementation, this could automatically adjust the bass level. To adjust left and right treble levels, a node would have to use separate zones or sub-zones for left and right. 

 | Data byte | Description                                                                                                                                                                                                                                                                                                                                                          | 
 | :---------: | -----------                                                                                                                                                                                                                                                                                                                                                          | 
 | 0         | 0 A value between 0 and 127 indicates the specific treble level to set. A value between 128 and 159 is change down by the specified number of treble levels. A value between 160 and 191 is change up by the specified number of treble levels. A value of 255 means that this is and extended event and that the specific treble level is sent in byte 3 and after. | 
 | 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.                                                                                                                                                                                                                                                                                                   | 
