Re: [LAU] JACK with many soundcards

On Mon, Jul 28, 2008 at 6:01 PM, Paul Davis <paul@email-addr-hidden> wrote:
>
> On Mon, 2008-07-28 at 17:51 +0200, Adrien DANIEL wrote:
>> Thank you very much, that seems to come up to my expectations !
>>
>> I take advantage of this thread to explain my thoughts.
>>
>> I was thinking about, for instance, an electric guitar with a built-in
>> ADC, that could be plugged in a computer via a USB (or Firewire)
>> cable, the guitar being recognized as a 'snd-usb-audio' device under
>> the system. With this view in mind, it might be useful to get many
>> "digital" instruments like that, as well as a DAC, all available in a
>> single JACK server.
>
> JACK is not designed to work this way. it was designed around the
> assumption that your instruments plug into some kind of audio interface
> (not necessarily analog, it could be all digital). individual
> instruments all showing up as distinct USB devices is really rather
> outside of the design assumptions that JACK was started with. in
> particular, there has long been a model within JACK that device
> aggregation was the job of the OS audio services (ALSA, CoreAudio etc).
>
>> Will JACK2 be able to handle this ? I mean, you run jack2_start, and
>> all the available (and desired) peripherals appear in the connections.
>> :)
>
> its possible. i don't think this is part of the plan at present. a
> future in which a USB hub is considered an audio patchbay, and audio
> apps have to interrogate the USB bus to determine what is out there ...
> well, its not inconceivable, but its not likely to take off, i think.
>
>> I suppose that it raises many issues like synchronization between
>> different physical peripherals. Handling many peripherals as separated
>> devices might not be optimal compared to one single device with
>> multiple inputs/outputs, as well. And actually I am not sure this idea
>> is really essential... :)
>
> not only is it essential, its really tending toward the silly. the
> converters in those "USB guitars" are not really very good for the most
> part, and besides a lot of people still strongly prefer mic-recorded
well somebody uses good quality cards you see ;)
http://www.io-sound.org/Guitars/Sahira/Sahira.html
> instruments. oh, and did i mention that a given USB bus will get totally
> saturated with very few channels, so to do this usefully for a bunch of
> performers you would need a lot of USB busses to connect to.
>
> --p
>
>
>
>
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