Screens
The output screen is directly to the right of the Interface, and in Dual mode the second output is directly to the right of the first output. The previews for the buses and screens can be found at the top and center of the application interface. The screen shot below shows the Single Output Mode, with the A/B cross fade below its preview area.

The cross fade mixes between the A (left) and B (right) Buses, and has some auto fade controls under it. The speed of the auto fade is based on the current TX Speed setting.
There is a Dual Output mode which allows for two independent screens which has been useful in some situations but rarely tested nowadays.
The management of the outputs and other application options can be found via the 'Configuration & Tools' tab, and accessed via the 'Configuration' button. This will display this dialog.

Buses
There are 2 Buses which can be cross faded on the Screens. The Bus Previews are either side of the Main Screen Preview at the top of the interface.

The the A (left) and B (right) Buses are color coded. The preview has a rotating grid background to help indicate transparent areas and a label to show which mode Bus is in. The A Bus is currently selected in the image above.
Each Bus can toggle between 'Mix' and 'Simple' modes and has 4 layers with 8 slots, giving a Bus a total 32 slots.
Bus Source Panel

The screen shot of the bus slot above shows
- A large slot output preview with the scratch control underneath.
- 4 input layer previews to the right.
- Each layer can be toggled between additive or matte mode, controlled and indicated via the overlay buttons to the right of the layer previews
- Green for the default additive mode, Orange when in Matte mode
- And a 'All' stop button, which will trigger a stop event for all playing slots in this Bus.
There are 2 basic mixing modes:
Simple mode: This mode only allows a single Slot playback at a time. (although this still includes the slot transition effect)
Mix mode: Splits the Rack into 4 layers which are then Mixed with the default mix mode (the effect as if you layered 4 projectors)
The layers relate to the rack layout.

Each layer has a Wet/Dry control on the rack, with an indicator showing layer level and active state. There are also a Mute and Solo options per layer, which auto-fade the layer levels. The fade speed is taken from the current TXSpeed setting. In the image above the 3rd layer is in Matte mode and the 4th layer is Muted.
At the side of each rack towards the center of the interface is:
- A bus selector button / indicator which displays which rack is currently active for keyboard control (also highlighted by the keyboard labels being visible on that rack).
- And 4 hot cue options.
The layers have an Attack/Release control and have a type of Polyphonic chord action. The behaviour for triggering of slots/layers is controlled in the top right of the interface, next to the TXSpeed setting. see 'Bus Racks'
Mixing and layer options
Mixer and layer plugins are color coded blue in the plugins list, here's a screen shot of a Mixer plugin and layer interaction plugin loaded (they have a blue background panel).

These types of plugins should work when placed in an FX slot of either a Bus or Screen slot. When in the Bus slot they should handle 4 layers and when in a Screen they should handle 2 buses.