[Ardour-Users] hdsp9652 - audio apparently duplicated on spdif output

[Mark Knecht]

On Tue, Feb 4, 2020 at 12:06 PM Giso Grimm <gg3137 at vegri.net> wrote:
>
> Hi Mark,
>
> On 04.02.20 19:18, Mark Knecht wrote:
> > Hi all,
> >    A voice from the deep, dark, long ago past has returned.
> >
> >    I've been using Mixbus32C for maybe a year now for just some personal
> > recording projects. Up until recently I was using a Scarlett 2i2 3rd gen
> > USB device and everything works perfectly well for my modest needs. In
> > the last week I dug out my Hammerfall hdsp9652, got it installed and
> > working in the machine. It works fine as a system audio card playing
> > audio out through playback_1/2.
> >
> >    I do have an issue though when using either Mixbus or Ardour. It
> > appears that with a default, new session setup, all of the audio
> > directed toward the playback hardware, at least with a default setup
> > that uses playback_1/2 on the Hammerfall card, this audio is possibly
> > duplicated on the spdif output. The easiest way I've found to duplicate
> > the problem is to create a new session, enable the metronome and hit
> > play. In HDSPMixer I see the click on both playback_1/2 and spdif.L/R.
>
> as far as I know the default routing matrix after starting hdspmixer
> mixes all playback channel outputs to SPDIF. In hdspmixer, if 'submix'
> is checked (make sure also 'Playback' is checked), you may select SPDIF
> underneath the playback channels, and de-activate all channels except
> e.g. 25/26. Keep in mind that this is a full 26x26 matrix - it is easy
> to miss some channels/matrix entries.
>
> A command line solution using amixer was discussed on LAU/LAD many years
> ago, I found a link here:
>
>
https://linux-audio-dev.linuxaudio.narkive.com/BBU5CilM/lad-headless-rme-hdsp-hdspm-mixer-settings
>
> This works fine also with the hdsp9652.
>
> Best,
>
> Giso
>
>
>

Thanks Giso. That seems to have solved the problem. I'd forgotten how
hdspmixer even allowed me to get to the mixing matrix. With your help I
found it and problem is fixed.

Cheers,
Mark
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