Two things. First I have found that with my 4000d it sometimes works when you want to get the PIV menu to hold down both mouse buttons and also the left shift key to get the menu. Try it and see what happens.
Second, I was going to leave my own post about the concierto sound. Mine is also very low. It plays loud if I am playing a music CD but is very low when playing MP3's. I have tried messing with the ahi settings and they don't really seem to do anything. I have everything set to maximum volume (PIV menu, mixer, ahi, amplified speakers, and it is still very low. It should be booming I would think. Any help with the ahi or anything else to fix this problem would be appreciated. Dan