On the back of the 3400 there are two sets of composite audio outputs. One set is variable the other is fixed. Before Sept 1st, the output was set to the highest and you had to turn it down -- with the volume control for the 3400, not the TV or receiver. They seem to have fixed this and turned the audio level down hence the result you are complaining about. To fix this, just turn the volume on the 3400 up (or switch to the other audio output pair).