[LAU] JACK and S/PDIF sync'ed delta 1010 cards: bad vs. evil?

Joe Hartley jh at brainiac.com
Thu Oct 15 18:51:32 CEST 2020

Hi, Jeanette!

It's been a while since I had my Delta 1010s, but lets see what I can remember.
The network amd Braille reader issue reminded me of an issue I had ages ago with my
1010s and a USB MIDI control surface.

I documented my fix at https://delta.brainiac.com/deltasync.html

In short, I had to modify the modprobe.conf file to make device labeling
consistent, then I built an .asoundrc file that combined the cards into a
single device.

This was a long time ago, and I was using Fedora back then.  I know that
modprobe.conf lives in  /etc/modprobe.d/ under Arch but I think that's the
only big difference between what's on my website and Arch.

Good luck!

On Thu, 15 Oct 2020 18:21:21 +0200 (CEST)
"Jeanette C." <julien at mail.uni-paderborn.de> wrote:

> Hey hey,
> I have two M-Audio Delta 1010LT cards, sync'ed via S/PDIF. Two ALSA devices 
> were created to sum the inputs and outputs respectively.
> On top of that JACK is running. Now, I noticed that it is a decision between 
> two problems that I face: if they are correctly sync'ed, some system services 
> regularly freeze. This includes the networ, the Braille display (connected via 
> USB). If, as has happened before, the setup isn't remembered correctly and the 
> S/PDIF sync is not made, occasionally the cards begin to have input problems. 
> The sound suddenly degrades with an effect like bad resampling (decimation 
> effect).
> I have had these cards running for a long time in this constellation, but only 
> in the past few years these problems cropped up. I have changed the distro 
> from Debian to Arch Linux. On Arch I have tested the system for realtime 
> operation several times, using the realTimeConfigQuickScan script.
> Could this be a kernel issues? Some ALSA update? Or a question of the kernel 
> patches that one is running? I am running the following two kernels now:
> 5.6.19-rt12-1-rt
> or
> 5.8.14-arch1-1
> The last time I ran Debian it was on a 2.6.3x kernel, IIRC.
> Any suggestions, apart from don't use your cards at once, would be very much 
> appreciated. :)
> Best wishes,
> Jeanette
> -- 
>   * Website: http://juliencoder.de - for summer is a state of sound
>   * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g
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>   * GitHub: https://github.com/jeanette-c
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       Joe Hartley - UNIX/network Consultant - jh at brainiac.com
 Without deviation from the norm, "progress" is not possible. - FZappa

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