Andrew Rossa [Cakewalk]
It's an easter egg that was put in to the module as already mentioned. Does nothing to the sound :)

It may do nothing to the sound, but in a deep cave in central Shingdap, a Dragon has his tail twisted each time.This is an undocumented contributor to global warming. Everyone knows that twisting a dragon's tail brings fire.

In other words Gswitz it gives that analog warmth. 

scook
I thought the CA2A documentation was adequate

 
I thought it adequate, too, but did not have it to hand when I posted, unlike the UA manual, which I did.
 
Several people in this thread seemed unsure of it's purpose, hence my posts.
 

scook
Still does not explain "What Turning the PC-76 Meter Screw Does"

No, but it does answer the questions/clear up the misunderstandings from people in this thread about what the R37 screw in the Ca2a does.
 
As to the OP - I couldn't really add anything.  I knew the screw moved, but just assumed it was an easter egg like the PC4K Bus Compressor, or the rather marvelous screws in the new reissue of iZotope's Vinyl.
 
 edited to clean up quoting

John
In other words Gswitz it gives that analog warmth. 

Yes, but only detectable by a world wide null test.

The next time someone starts an argument about whether Sonar or ProTools is better, mention this feature.  That should end the discussion.

konradh
The next time someone starts an argument about whether Sonar or ProTools is better, mention this feature.  That should end the discussion.

This is so true. If it doesn't, the last, most stubborn ProTools proponents will have to surrender when they find out about "backlight" feature.

konradh
The next time someone starts an argument about whether Sonar or ProTools is better, mention this feature.  That should end the discussion.

That is so funny! Great post! 

Zargg71

scook
 
Still does not explain "What Turning the PC-76 Meter Screw Does"

It starts a transparent-on-transparent scroll of the script for a parody of Taming of the Shrew called Turning of the Screw, courtesy of the Baking Bards of Beantown.

I say, screw it!