Hi i just recieved my FD-4 Multitracker ,which i am real pleased with super clear recording and excellent for vocals ,my only problem is i want to connect my Behringer XENYX 1002 FX mixer to it so as to use the effects ,now there is a fx send on the Behringer XENYX 1002 FX but where do i plug the return ,only i cant see anyhere on the mixer,best wishes Brian.