hi Flo,

Thanks for your reply.

On 10/11/10 15:28, Florian Faber wrote:

Matthew,

...

Of course, you can adjust the volume digitally (though since hdspmixer overwrites all your routing every time you open it, it's a bit annoying to use). However, the card appears to have a dedicated a analogue gain stage just for the headphones. It's not a full PGA, but can be set to 0db, -6db, -12dB and mute - under windows. The ALSA driver only gives the first 3 options as controls.

Ah, yes, that is something special with that old cards. I actually had to look it up in the manual.

Are you sure? I don't have one, but it looks like the AIO is very similar: http://www.rme-audio.de/images/products/aio_set.gif

Anyhow - hardly important! :)

...

I had a quick look in the code, and it seems there's a 2-bit field in the 9632 control register for controlling this. Sounds neat, as we have 4 possible values. Can anyone confirm that the unused value (0x10, IIRC) in the ALSA driver is used to mute the headphones?

I only have the sources for the newer cards, sorry. Just try it out, nothing bad should happen there.

Hmmm, is there any advice you can give me on what might be affected or need modifying to stay in sync? I've not contributed to a project like this before...

The obvious ones to me are of course the driver itself, and adding a new radio button to hdspconf. Is there anything else?

Thanks a lot, Matt