[LAU] RME HDSP 9632 - amixer control

[Klaus Schulz]

Hi Giso and others.

If you read the thread at alsa-devel - you refered to below - it seems that
more people were facing this issue already in 2003.

It seems that the whole thing works only, if you use the default
setting/routing.

Currently at factory default  HDSPmixer routes the first playback channel to
the first Adat output, which happens to sit right below playback out1/out2
in the HDSPmixer graphics.


Correspondingly this  would mean I need to use an Alsaplayback channel out
13/14  to get to AN3+4. I think it is worth a try.
But - how do I output data to alsa-playback channel 13/14 on my device 0 ? I
am using ecasound and alsaoutput 0,0 right now for out1/out2. No idea how to
assign 13/14.

Since the earlier discussed amixer method won't work -- at least in my case
- I am wondering if the commands

/usr/bin/amixer -c 0 cset numid=5 26,2,32768
/usr/bin/amixer -c 0 cset numid=5 27,3,32768

reflect the HDSP logic:

The logic in HDSPmixer to setup the route from Alsa Out1/Out2 to my AN3+4
output:

1. Assign playback channels Out1/Out2 to AN3+4 output channels. This will
automatically mute playback channels out1/out2 . Now you need to unmute the
playback channels.
Only this action will activate the new outputs. ( This you'll see if you
look in the HW-output selection field)

The output channels AN3+AN4 themselves run at 100% or 0db at factory
default. No need to touch them. However would be nice to know how to control
these with amixer.

(Note: What's strange though playback output 15/16 is muted by default!?!)

Were not yet ready:

To get rid of a connection e.g. the default Adat routing, since now traffic
is routed to AN3+4 AND Adat A1+2 you:

2. Select the Adat channels A1/A2 on playback channel Out1/Out2. Now you
mute and then unmute manually playback channels Out1/Out2. Without this
manual action nothing will change.
   No idea how to do that with amixer.

The mute/unmute of playback outputs seem to play fundamental role in the
routing process. Perhaps something in this area goes wrong. Again: Is there
a way to explicitely control  channel
volume with amixer?

( Beside that I figured that  "mute" on MASTER and Playback Outs, does not
work at all with HDSPmixer)

Cheers
\Klaus







On Fri, Oct 23, 2009 at 9:16 AM, Giso Grimm <gg3137 at vegri.net> wrote:

> Hi Klaus,
>
> I hope you don't mind that I copy the reply to LAU (there are a lot RME
> hdsp-users who probably know more about it that I do).
>
>
> Klaus Schulz wrote:
> > 1. Could you please share your .asoundrc. I guess it is the .asoundrc
> > where you set "DSP".
>
> It is not defined in the .asoundrc, but on ALSA itself: Try "cat
> /proc/asound/cards" and find out the ALSA-name of your card, e.g. here
> on my office PC it is:
>
>  0 [PAD            ]: Digi96 - RME Digi96/8 PAD
>                      RME Digi96/8 PAD at 0xfd000000, irq 21
>  1 [DSP            ]: H-DSP - Hammerfall DSP
>                      RME Hammerfall HDSP 9632 at 0xfeae0000, irq 21
>  2 [ICH5           ]: ICH4 - Intel ICH5
>                      Intel ICH5 with AD1985 at irq 17
>
> (the hdsp9652 is at home).
>
> > 2. 32768=0db  refers to the playback controls, They  run at 0db at 32768
> > and +6db at 64k
> >     However  this seems to be somewhat different on the ouptuts. 0db=max
> > position. I'd guess this should be 64k by default.
> >     Question: What do I actually control with below commands? I guess
> > the playback-inputs  only. How do I control the output channels?
> > Probably I need to set it to 0db to.
>
> The mixer in the hdsp cards can control routing from hardware inputs to
> hardware outputs (for 'zero' latency monitoring) and the software output
> to hardware outputs.
>
> Hardware inputs are channels 0-25, software outputs 26-51, hardware
> outputs 0-25. I don't think you can control the playback attenuation
> with amixer. It might be (but that is a guess) that hdspmixer attenuates
> the output channels only in software (by adding the output attenuation
> to all relevant input/playback channels); When controlling only via
> amixer I do not have to configure the output attenuation.
>
> The channel mapping is also discussed here:
>
> http://www.mail-archive.com/alsa-devel@lists.sourceforge.net/msg06019.html
>
> > 3. I tried without success:
> >
> > /usr/bin/amixer -c 0 cset numid=5 26,2,32768  #first playbackchannel to
> > first output of analog extension board (ch2)
> > /usr/bin/amixer -c 0 cset numid=5 27,3,32768  #first playbackchannel to
> > first output of analog extension board (ch3)
>
> The channel numbering starts with zero. I do not know if the extension
> board uses the same channels as ADAT out, maybe try also channels 8-15.
>
>
> Cheers!
>
> Giso
>
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