Move the mouse over the keyboard to see which layers belong to which key (note the velocity restriction also),
Use the Track drop-down list to choose track.
The column to the left shows a list of available generators.
The first column is the Global layer. There is always a Global layer, even if it is empty. If a value is defined in the Global layer, but not in the layer itself, then the global value will be used. ,
The values define in this table are combined with the corresponding value in the Instrument used by a particular layer.