I am setting up a small system that consists of a Kenwood TM-V71A dual band and a Uniden SDS200 scanner. I would like to monitor both radios simultaneously through a mixer; one signal in one ear, the other in the other ear. When something of interests presents itself, I want to simply turn down the other radio. I purchased ax XENYX 502 as it looked ideally suited to this task. I am having problems. I can listen to the scanner with the balance set all the way to the left but am not getting the same result from the Kenwood. Dialed over to the right, I show activity but cannot hear it. I can hear it fine until I try to isolate it to either left or right. Ideas? Thanks.