I've enclosed my project for somebody who can take a look and maybe help me:)
The problem is that I cannot get signal on output channel no 0,2,4,6. When I put a level indicator on one of this channel on the schematic it shows that there is signal but on phisical output is silence. I've made a test and swap left and right channel before T connection and it is still no signal on the number 0,2,4,6. Is it matter of some register settings maybe? Please help!