[LAU] Multiple sound cards

Alf Haakon Pietruszka Lund alf at mellomrommet.no
Thu Jun 10 16:57:01 CEST 2021

On 10.06.2021 16:33, Len Ovens wrote:
> On Thu, 10 Jun 2021, Alf Haakon Pietruszka Lund wrote:
>> I was amazed at the ease of this setup and the problem-free routing of 
>> audio signals, so just for testing I split a stereo source recording 
>> one channel on each device to one stereo track in Ardour. To my ears, 
>> the sync is still perfect.
>> However, from this article 
>> https://jackaudio.org/faq/multiple_devices.html it seems I have to 
>> expect sync problems over time unless I do some manual configuring 
>> using the alsa_in and alsa_out clients.
> Studio-controls already does this for you except it uses zita-ajbridge 
> instead of alsa_in/out for better quality and less cpu use.
> However, I would still not split a stereo source over two devices. It is 
> likely that the stereo image will wander some even though the two 
> channels are "in sync". So long as there is some isolation between the 
> two mics there should be no problem but a set of mics for one instrument 
> (like a drumset for example) should all be on the same audio interface. 
> So using more than one USB mic for podcasting should be fine. For 
> recording a "live in the studio band" a single audio device or two 
> connected with wordclock are still better.

I did that just as a for-fun test, definitely will get bigger number of 
i/o for bigger recordings.

Still amazed at how smoothly this just works.

Thanks for answering, and for programming!

Best regards,

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