CA-2A Compressor on vocals - settings? How much gain reduction?

For those of you using the ProChannel CA-2A compressor on vocals - what are some typical settings that you use? How much gain (in db's) do you typically aim to reduce?

It really does vary from track to track.  I know it's a well worn phrase on here, but I do use my ears. Basically start with "less" and increase 'til it sounds nice.
 
Playing around with the R37 screw can be good. Of all the compressors in Sonar, I think the Ca-2a is themost intuitive to set up.
 
With vocals, I like to put the PC76 first to catch any peaks, and then put the Ca-2a to generally level the signal and add character and warmth.

Similar to jb, except I use the concrete limiter instead of the PC76 to catch peaks.
 
How much gain reduction to use depends on how much the vocalist's level changes, and how good they are with mic technique. Someone who knows good mic technique will move in closer or back away further to create "manual compression." In that case you don't need to add as much electronic compression.
 
I often mic my voice really close to take advantage of the proximity effect. In that case, I need to add a lot more compression to even out volume levels. When I do background vocals, I don't close mic and use mic technique so I don't have to compress as much.

I also often use a PC-76 before the CA-2A, to smooth things out a touch and catch peaks that require a faster attack.  The PC-76's attack can be set faster than the CA-2A's fixed/automated value.
 
You may be surprised how much you can push the CA-2A (heavy gain reduction) and still have it sound sweet.
 
As for the R37 screw...first of all, I really wish this was a knob, or had an arrow/value-window so we can tell where it's pointing.  But to get back on track, I tend to keep this flat or toward the HF.  I'm interested to hear when others would use a lower-than-flat setting, as it's not well-documented.

Good answers so far - let's hear more.

Again, the gain is just make up. In other words, it comes AFTER any peak reduction and has no influence on the actual reduction. This may not be obvious from the physical arrangement of the knobs but it's the way LA2A's work. So setting it to any pre-defined level is pretty useless soundwise, unless you just want to always make your vocals louder. Set peak reduction to taste, then use make up gain to get back a reasonable level. Switch bypass on/off to compare if you like.