The Params Dialog is in many ways the heart of the Synfig interface. This is where all the parameters of the layers you create are edited, and in some less obvious ways,
The layout of the Params Dialog is quite simple - it is simply a two column list
The first column, named 'Param', is simply an expandable tree listing of the parameters of the selected layer. Most layers do not have many nested parameters, with the exception of the Vertex List on most Geometry layers.
The second column, 'ValueBase', is where the data for each of the parameters are listed. Several different types of data can be shown here.
Params and Layers
An interesting feature of the Params Dialog is that - when you select two or more layers in the Layers Panel, the Params Dialog will only show the parameters that are *shared* between the layers. When the dialog is in this state, context-clicking on the parameters will allow parameters to be linked between the two layers. (write more)
There are three params that are shared between nearly every layer: