I had  the opportunity at lunch time to purchase the Presonus "Faderport" for my system : 
Win 7
Dual core
SONAR Professional
I did not make the purchase, due to the fact the Box read: Windows XP required. Any one try this faderport yet?
meanwhile ill check out Presonus website.
 
Thank you

I have been using Faderport on Win7x64 for quite a while now...
 

I use it in Windows 7x64bit with Platinum. Works great. You'll want to search you tube for the video that shows you how to get it working. I remember putting in a command prompt and typing "regsvr32 C:\Program Files\Presonus\FaderPort.dll" something or other. Watch the video. It's an easy fix.

Here's the link. http://youtu.be/w--ExBYbbNk