This is a big unknown. The ones that brought this board in are long gone and no knowledge was passed on.
So far the only thing I can hear is that 23 & 24 control the level of the main speakers. I don’t know about layers, but I’m trying to read through the manual and learn.
And yes, the light on the button under Custom is lit, so I’m assuming from what you said it is operating in Custom Layer mode.
If this is a Custom Layer, will I need to add Mix 7-8 to the Layer? (I’ll try to figure that out from the manual)
I will try pressing the Mix 7-8 button to see what happens.
I believe the light on the LR button above the Master fader is usually lit.
Thanks for the input!