Add default value to the ChannelFunction - Default field

Author: petrvanekrobe

gdtf-spec.md

@@ -1939,7 +1939,7 @@ currently defined XML attributes of channel function are specified in
 | Attribute          | [Node](#user-content-attrtype-node )         | Link to attribute; Starting point is the attributes node. Default value: “NoFeature”.                                                                         |
 | OriginalAttribute  | [String](#user-content-attrtype-string )     | The manufacturer's original name of the attribute; Default: empty                                                                                             |
 | DMXFrom            | [DMXValue](#user-content-attrtype-dmxvalue ) | Start DMX value; The end DMX value is calculated as a DMXFrom of the next channel function – 1 or the maximum value of the DMX channel. Default value: "0/1". |
-| Default            | [DMXValue](#user-content-attrtype-dmxvalue ) | Default DMX value of channel function when activated by the control system.                                                                                   |
+| Default            | [DMXValue](#user-content-attrtype-dmxvalue ) | Default DMX value of channel function when activated by the control system. Default value: value of the DMXFrom field                                         |
 | PhysicalFrom       | [Float](#user-content-attrtype-float )       | Physical start value; Default value: 0                                                                                                                        |
 | PhysicalTo         | [Float](#user-content-attrtype-float )       | Physical end value; Default value: 1                                                                                                                          |
 | RealFade           | [Float](#user-content-attrtype-float )       | Time in seconds to move from min to max of the Channel Function; Default value: 0                                                                             |