How to change output format in Clocked Video Output

hsj...I am working with Quartus 11.1 with the CVO and am trying to do realtime config between 720x480p and 640x480p. I originally overlooked address 28 which is the 'valid' reg. really important to set that after Nios has configured Mode1.

Also, CVO doesn't care about your clock...how are you changing freq? Do you have a memory mapped PLL? I am going to add that but I currently have the PLL hardcoded in Verilog, not in Qsys system, running at 27Mhz.