[LAU] Can't get Layla24 digital inputs working with jack

[Robin Gareus]

On 06/30/2012 09:22 AM, Carlo Ascani wrote:
> Hi,
> 
> I own a Layla24 [1] soundcard and an ada8000 [2] digital converter,
> they are linked with an optical cable (and a bnc for wc).
> 
> Using echomixer I can see VU meters rising on digital inputs.
> Anyway, when I start jack I can use only the eight analog inputs.
>
> I start jackd with "jackd -d alsa -d hw:1 -r 44100"
> jackd version is  jackdmp 1.9.8
>
>
> Here is my "aplay -l":
> 
> **** List of PLAYBACK Hardware Devices ****
> card 0: Layla20 [Layla20], device 0: Analog PCM [Layla20]
>   Subdevices: 10/10
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
>   Subdevice #2: subdevice #2
>   Subdevice #3: subdevice #3
>   Subdevice #4: subdevice #4
>   Subdevice #5: subdevice #5
>   Subdevice #6: subdevice #6
>   Subdevice #7: subdevice #7
>   Subdevice #8: subdevice #8
>   Subdevice #9: subdevice #9
> card 0: Layla20 [Layla20], device 1: Digital PCM [Layla20]
>   Subdevices: 2/2
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
> card 1: Layla24 [Layla24], device 0: Analog PCM [Layla24]
>   Subdevices: 8/8
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
>   Subdevice #2: subdevice #2
>   Subdevice #3: subdevice #3
>   Subdevice #4: subdevice #4
>   Subdevice #5: subdevice #5
>   Subdevice #6: subdevice #6
>   Subdevice #7: subdevice #7
> card 1: Layla24 [Layla24], device 1: Digital PCM [Layla24]
>   Subdevices: 8/8
>   Subdevice #0: subdevice #0
>   Subdevice #1: subdevice #1
>   Subdevice #2: subdevice #2
>   Subdevice #3: subdevice #3
>   Subdevice #4: subdevice #4
>   Subdevice #5: subdevice #5
>   Subdevice #6: subdevice #6
>   Subdevice #7: subdevice #7
> 
> [1] http://www.echoaudio.com/Products/Discontinued/Layla24/index.php
> [2] http://www.behringer.com/en/Products/ADA8000.aspx
> 

Hi Carlo,

Apparently, the Layla shows up as two independent sound-cards.
jackd can only open one device at a time. So you will need to combine
those cards into one.

There are various way to achieve this. I suppose the appropriate
solution here would be to use pcm.multi.

see http://jackaudio.org/multiple_devices and
http://www.alsa-project.org/main/index.php/Asoundrc#Virtual_multi_channel_devices
and

HTH,
robin