Thanks in advance I know your guys have the answer. I need help setting up Allen & Heath Qu 16 as a control surface for Platinum. I can find a set-up for everything but Cakewalk. Point me in the right direction Please.

If the Allen and Heath has an emulation you can invoke (make it do) such as Mackie, or and other of the "popular" emulations then you can likely use the Mackie Control Surface driver that is supplied with Sonar or one of the others in there. Otherwise your options may quickly become slimmer. You can also load up the cakewalk ACT controller and see what happens. I'm assuming that you can connect this to a PC using USB as usb midi is most prevent today.
 
Sorry.

That is some solid information I will try them both and see what happens.

The only specialized solution I known:
http://www.azslow.com/index.php/topic,178.0.html
 

There are two solutions. A&H have added daw control for windows which could act as a HUI emulator in Sonar. Then as Azslow3 indicated there is his plugin for Sonar specifically which does the same thing but is customizable. I have the QU 24 and prefer the Azslow tool.