Set up a table that uses any channel into the SDL to control brightness of the SLM.
If you want, use a 3d table, one axis Backlight brightness, and the other channel the control for the SLM brightness (pot or multi position switch for example). Set up the table so that the slm follows backlight brightness and also the other channel, this way both channels can control its brightness the way you want it to.
Cant seem to work out how to do it, I havent setup a 3D table before so its a bit confusing. I can get a table up and select some channels but cant really work out what I'm actually doing.
You can also use timers in it.
What would I use timers for ?
With what do you want to control the SLM brightness?
Hadnt really thought that far ahead

I just wanted to see if it was possible to do. I guess having a hi/low switch would work for me unless I can set it up to drive from high to low by pressing one of my existing SDL buttons setup for scroll next or ack alarm for say 5 secoonds or something.
Thanks for everyones help and I have too experienced the blinding intensity of the lights at night at the most inconvinient moment
