FabFilter

Maybe this?
itunes.apple.com/us/app/remote-mouse-mobile-trackpad/id385894596?mt=8

Haven't tried it myself, doing it now, cuz I am looking for a similar solution :)

or, addressing network security issues, this one?
itunes.apple.com/app/id407659209?ls=1&mt=8

you could always just midi map to the hardware controller of your choice. best of both worlds: fabfilter functionality, hardware tactile control.

www.neyrinck.com/v-control-pro

This app is killer for controlling a DAW, and it lets you control plugin as well!