I recently went and purchased a new setup and part of it was a Berg4L Four channel Lightweight Receiver that the clerk at the local hobby shop recommended for the plane i purchased, when I got home and inspected it further it seems he sold me one with one less channel than i need. My plane has 4 servos and I assume one channel for the esc, now i realize that this may be a dumb question but would that mean I would need to go return and purchase a new receiver or can I put the ailerons on some sort of mixer reducing the 2 servos effectively to 1 channel.

Thanks in advance,
Jake