There are only a few scandoublers for the videoslot that sopport AGA. Apart from tha onboardscandoubler of the PIV there is only the CV3D Scandoublermodule and the videoslotversion of the Scandex from Micronic. All the other older scandoublers are ECS only, the oldest of them even have a problem with that. So your best bet would be in fact one of these on-chip scandoublers or external ones that, for all I know, all support AGA.
