[Bob van loosen] added a remote learning circuit made from a PIC 16F84A to his Onkyo receiver - which happens to have remote buttons and a ttl control link for external devices. The PIC listens to the remote link on the receiver. By grounding a pin, it will learn the next remote command that's received. In this case, he uses it to swap the left/right front/rear signals to gain proper speaker … [Read more...]