I don't think you can change the volume of digital sound outputs. I mean what would it look like? Bigger 1's and 0's?
Sorry to piggyback on your question but I have a question that's related.
My HD channel sound volume is really low. I have an Onkyo TX-SR575 receiver. I have fiber outs going into my receiver. For the analog channels, my sound output is fine. At volume level 18 it's nice and loud.
For HD channels tho, I have to turn it up to 30 or even higher sometimes to hear good volume.
I know the HD channels output in Dolby Digital, and some of my channels output in Dolby 5.1 surround.. but I thought the analog channels also output in Dolby Digital. It's a digital receiver so I thought all sound is converted to digital if it's analog.
I've tried every surround setting on my receiver and nothing really brings up the volume. Not even changing it to standard 2channel stereo on my receiver.
I have advanced sound turn on, matrix, and high compression. I've tried light compression and no compression and nothing changes. I don't even know what the compression setting is even doing because I don't hear a difference when I change it.