Display of the layers is really well covered already.
You can choose your preferred User colours for each of the two layers.
Layer A - Purple
Layer B - Yellow
Those colours are then used by the LED ring which encircles the platter, which changes to the colour of the layer which is currently being controlled.
The round LAYER switch to the left of the display also takes on the colour of the layer which is currently being controlled.
Also, the layer name ( A or B ) of the layer currently being controlled, is shown in the lower left corner of the main touch screen display.
And…the scrolling waveform display shows both layers waveforms on the screen. Switching the currently controlled layer and the other layer from the main part of the screen to the lower section of the screen - always with play position of both tracks and “end of track” warning colour pulsing hints.
Plus, whenever the layer control is switched from A to B or vice versa… the layer which you’ve just switched to is displayed briefly in the centre platter display.
So overall, thats 5 indications of which layer is currently in use - just on the player itself.
Additional indications could also include the mixer that you’ve got the SC5000 plugged into. That will probably show bouncing lights/LEDs on a playing channel also, and headphone cueing will help differentiate channels/layers also.