[Kevin]

Whether or not your fraternity was backed by IFC is irrelevant for any group. Now as to whether you are free to pledge whoever, I can speak for Sigma Nu and tell you that it's a definite no. I can tell you I am aware of no exception with any GLO which allows dual memberships. There are some professional greek letter orgs which do allow dual memberships, but as far as social fraternities, I'd say you're stuck with AEPi as you would be an AEPi alumnus.