OK thanks. So nothing fancy with a dual VC. Adding a resistance would sure effect overall SPL with but for stage monitors this might be acceptable if one was trying to control volume on one part of a stage.Here's the link to the other switch.
http://news.harmony-central.com/News/2003/AccuSwitch.html
You have to go to the accugroove site to find out more about it.
But as I mentioned - folks who actually measured it say it does't work.