I asked because earlier you posted this:
It shows your HDMI as card 1 device 3 (1,3)

Yes that was on the unit I've been testing at work ... and it only started working after putting some stuff in modprobe.d/alsa.conf ... but the same did not work on the unit I've at home. Maybe chemfire's suggestions might fix that but the kids are still watching toons ... but they've got chickenpox so I think I'll let them watch TV or they'll drive my wife nuts.

Oh I see. I missed the part of the 2nd PC.

chemfire's suggestion got the master to catch the HDMI audio out but I don't get any output from the 3.5mm jack now.
It's not a big problem because I don't plan on using the audio jack right now ... but it would be nice if it all worked ...
maybe one day I'll wire up a home theater system and I might want to use the 3.5mm jack too.

sorry for the late reply. Been away for a few days. louigi600 you should be able to do what you want but will probably need to add another plugin (route) to you chain of stuff in asound.conf. I don't have multiple cards or I would experiment for you.

You can some help on the route plugin at http://www.alsa-project.org/alsa-doc...m_plugins.html

If you are using my asound.conf, I expect the "best" place to insert it would be as the slave for softvol plugin (so that will affect both cards) than one of its slaves with be rate_convert, and than you will want to add an additional plug -> dmix -> hw chain so you can control the sample rate, and buffers separately. Depending on the card you might need to go to 44100 and not need the large buffer hdmi audio seems to need.

I'll have a look at that asap ... I had an accident yesterday while plying with some build scripts ... to put it short I did something really silly:
I was building as root and the missing 'DIR' in the remove command made a mess of my NUC's installation (it actually did quite a clean job removing almost everything)

I then changed the remove command to
Just to make sure I don't start accidentally removing stuff recursively from / again !

The video and audio content were safely mounted ro on nfs share so I only lost local stuff ... curiously I did that to prevent my wife from making a mess on the NAS ... was not expecting it to prevent myself from making the mess :-D

I got it installed again and most of the setup customization is done just got the fine tune for audio routing to be done ... but I'll have a go at that after having documented myself better.

I had a first look at the alsa documentation but it left me still a little puzzeled.
I want to add a new knob for the hdmi port (0,3) and I want it to be routed to the master mixer.
The latter I obtained by just having this in the asound.conf
but I'm still left clueless as to the former. What was achieved really simply with the older bios seems to be a quest with the new visual bios: Intel thanks for the progress :-D

"add a new knob" do you mean a volume control? HDMI basically just muxes in a byte stream there is no concept of gain in the analog amplification sense. The only thing you can really do is add a softvol plugin to change the amplitude digitally.

pcm.HDMI {
type hw
card 0
device 3
}
pcm.!default {
type softvol
slave { pcm "pcm.HDMI" }
control.name "Master"
control.card 0
}

Should give you your volume control but I expect you will find you need a dmix and rate convert for all streams to play correctly.