hi 619tech, i noticed that there is a bal-fade button. when you push it once, that's balance, but when you push it again it doesn't say or do anything. wonder if the radio is just limited to left ,right and not front rear because it's a cargo van with door speakers only? i have the radio out right now and i don't see any extra speaker wires. i speculate, that radio is capable of L-R only. of coarse i could be wrong. mechanically, i'm pretty good, electronics, not so much???