The solution once known is pretty easy. First off you need to download and install Aquasuite 4.72.00 from the software section. Close down (not uninstall, they can both be installed on the same system quite happily) Aquasuite 2012 (best to disconnect the Aquaero from the USB header as well) and connect one of your PA2's to the motherboard USB header. Then in the 4.72 software, which will show the PA2 you need to set an individual address for each unit, I cannot rememebr the exact tab it is on but the default is 50, so you can keep one at 50 then the others will be set to 51 and 52, get the idea. This same process needs to be followed if you are using more than one multiswitch and possibly pumps but I do not use the AquaComputer pumps so cannot be sure.
Ok, so once you set individual addresses for each PA2 you can then reconnect your Aquaero back to the USB header and obviously disconnect the PA2 from the motherboard. To connect the PA2's to the Aquaero you use what is called an aquabus cable which is essentialy a fan header cable with female conectors at each end. Each PA2 has 2 of these connectors and you basically just daisy chain them with one end of the chain going to the Aquaero Fast Aquabus connector.
@Cliohaxes, appreicate this is one big happy family but, without sounding funny please could you refer solutions to the original poster or even the thread (this is the exact text I gave you back in April). After all we do not want to miss out on aquadrops now do we!