[PD-dev] audioindev with several devices

[David Merrill]

yes, I've heard that alsa has the ability to create a single, "virtual sound
card" from multiple individual cards, but so far I haven't been able to make
this work - I'm interested though, to hear from anyone who has done it. also
heard a rumor that new versions of jack may be able to connect to multiple
cards at the same time - again, I don't have specific info, but am curious
to hear if anyone has done it.

to find the post online about wiring the clocks together from multiple sound
cards, google: el cheapo howto

-Dave M.

On 9/17/07, Tim Blechmann <tim at klingt.org> wrote:
>
> actually, i have never done it, but wouldn't you have to link the clocks
> of both audio devices in order to avoid timing problems?
>
> wini one told me that one can combine devices with alsa, which includes
> some code, that actually synchronizes multiple audio-devices by
> software, which includes resampling in order to avoid timing
> problems ...
> iirc, pd doesn't include such error correction, so it might be a source
> of unwanted audio dropouts ...
>
> best, tim
>
> On Mon, 2007-09-17 at 09:06 -0400, David Merrill wrote:
> > I have only done this in Linux, but here are some thoughts:
> >
> >  - are your device numbers *really* 2 and 13? In my experience, they
> > start at 1, and are numbered sequentially, meaning that you'd have to
> > have a lot of sound cards in your system to get all the way up to 13.
> >  - when you list channels, you typically give a number of channels for
> > each sound device that you're using, and I always list in and out
> > separately, as in:
> >
> > -audiodev 1,2 -inchannels 2,2 -outchannels 2,2
> > (meaning that I'm using devices 1 and 2, and each one has 2 ins and 2
> > outs)
> > -David M.
> >
> > On 9/16/07, João Miguel Pais <jmmmpais at googlemail.com> wrote:
> >         Hi,
> >
> >         I wanted to use two soundcards for input, my built-in stereo
> >         soundmax and
> >         an rme multiface (for output only the rme). I tried the
> >         following
> >         parameters,
> >
> >         asio
> >         audioindev 2,13 (2 is soundmax, 13 the rme)
> >         audiooutdev 12
> >         channels 18
> >         audiobuf 40
> >
> >         but it didn't work, only one device was taken by pd, the rme.
> >         Is it
> >         possible in windows to have 2 different soundcards working?
> >
> >
> >         Thank you,
> >
> >         João Miguel Pais
> >
> >         --
> >         Friedenstr. 58
> >         10249 Berlin
> >         Deutschland
> >         Tel +49 30 42020091
> >         Mob +49 162 6843570
> >         jmmmpais at googlemail.com
> >         skype: jmmmpjmmmp
> >         http://www.puredata.org/Members/jmmmp
> >         IBM Thinkpad R51, XP, Pd-Ext-0.39-2-t5
> >
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> >
> >
> >
> > --
> > MIT Media Lab
> > dmerrill at media.mit.edu
> > http://web.media.mit.edu/~dmerrill/
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> --
> tim at klingt.org    ICQ: 96771783
> http://tim.klingt.org
>
> Nothing exists until or unless it is observed. An artist is making
> something exist by observing it. And his hope for other people is that
> they will also make it exist by observing it. I call it 'creative
> observation.' Creative viewing.
>   William S. Burroughs
>
>


-- 
MIT Media Lab
dmerrill at media.mit.edu
http://web.media.mit.edu/~dmerrill/
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