I have a Voyage vr9000 I just got off ebay. Radio looks like new and sounds awesome with loud audio and great receive swings around 30w. My problem is I keep hearing that this radio has talkback but i see no control for it. When I turn on my amp and key the radio I get a nasty squealing you can hear in the amp itself and the power shoots up to 300w asap. I can turn amp off and radio alone talks fine with no squeals. I also hear no talkback from this radio even with the echo turned on. I have been seeing ways to disconnect the talkback on this radio by cutting a wire but my radio has no wire there to cut. I just want to be able to run this radio with my amp it's a kl-503...