I just bought and installed my second leptronix board because I had a problem with the first one but now i am having the same problem with the second so i was wondering if anyone here could help me out since it might be somewhere else. When the aux-in mode is on, the music will only play through the left speakers but when i am listening to the radio and Cd's everything seems to work fine and i can hear sound in all of the speakers. I have tried switching aux cables, mp3 players, and the leptronix boards. I did just notice that if I change the balance to only the right speakers and if i max out the volume of the car radio to 40, I can hear static and the music playing very quietly through the right speakers but u really have to listen for it. I don't know if its the soldering although I have it in the correct spot and I did it two times already. I really want to fix this problem because I was very pleased with the first one I installed until this problem started to come up.