I just got around to trying to install one of those CD players in 2 of my aircraft. The first was a Gulf IV. It showed up along with 1/2 of another player combined with some other gauge. I reversed the install, Checked it twice and the panel folder was returned to its original configuration. I started the gulf IV up and behold the player was still there and the 1/2 duplicate was gone! The player works great but I dont know how the devil it could still be there!  So the next day I tryed to install it into my C-310, followed the instructions religiously and this time nothing at all! Tryed again and still no go! So I removed the lines I put in thinking for some odd reason I would get lucky again. No way.  The radio in question is (Radio CD 4.)  What do you suppose is going on? I really like the one I do have but shouldent!! A little help please---Wildie