Both the CV64 and the CV64/3D linked together with its scandoubler are great in my opinion. I also use the CV64 together with the Phase 5 scandoubler. In this case I have the Phase 5 scandoubler in the bottom video slot of the A4000's daughterboard and the CV64 in next Zorro slot up. I then use a lead to feed the Phase 5 scandoublers signal into the INPUT side of the CV64 :-)
Here's a pic with the position where the Phase 5 scandoubler connects to the CV64/3D using a tiny lead circled (well it's more of an oval than a circle really :-D)
When using the Phase 5 scandoubler and CV64/3D i have PASSTHROUGH =YES in the monitor driver and the PC monitor goes on the Phase 5 scandoubler itself. No problem with playing old games or displaying native Amiga screenmodes in an A4000 8-)
