The layer function, The layer function -10, Ode) and – Kurzweil Forte User Manual
Page 245: For lay

Multi Mode
The Split and Layer Soft Buttons
10-10
When you press the Split button, and the Forte automatically activates another Zone in
the Multi for you. The previously active Zones will keep their previously assigned keyboard
ranges. After this you can choose a Program that will be used in the left hand as a Split
Program for the newly activated Zone.
The Layer Function
When you create a Layer in a Multi, you are activating a new Zone within the current Multi.
If the current Multi already has its maximum number of active Zones and you press the
Layer Function soft button, then a message will appear on the display indicating that you
have reached the maximum number of active Zones. Once you have saved your Layer, you
can continue to add Layer or Split Zones to the Multi until you reach the maximum number
of active Zones.