Gang syncing multiple sliders

[heynewt]

Hi, I'm building my first rig in MAX, and I'm building out the facial component.  I have 4 eyelids I want to have independent control of (see pic) so I assigned each one to a slider (they rotate in, not morph).   But I'd really like to be able to sync them to a master slider for blinks and actually the majority of my eyelid work. 

What's the technique for syncing sliders?  Or is there a much easier way to approach eyelids?

Thanks,

Robert

[heynewt]

I think I can do it this way in the manual. 

https://knowledge.autodesk.com/support/3ds-max/learn-explore/caas/CloudHelp/cloudhelp/2017/ENU/3DSMa...

I didn't realize you could control a slider with a slider, though figuring out the expressions is going to be challenging.