I have a 24' x 12' x 52" AGP with an Aqua Trol SWG and a single-speed pump that needs replacing. I'm ready to order a 2-speed pump (Pentair Dynamo 1 hp) but am uncertain about the circuitry. Do I need to order a separate timer/switch/controller for the 2-speed pump? How do I interface the pump with the Aqua Trol so that the SWG timer is slave to the pump timer? Please advise. Thanks!