Documentation

[Luis de Bethencourt]

On Fri, May 2, 2008 at 2:01 PM, ttoine at ttoine.net <ttoine at ttoine.net> wrote:
> Philipp,
>
>  It is not so easy. First of all, depending of the sound card chipset,
>  some will start with a period at 2, some at 3. As there is no database
>  about that point (I can't find one), anyone will have to test. It is a
>  good idea imho to create a wiki page with the tested setting of the user
>  community, but I don't know if it is easy to motivate people to fill that.
>
>  Second point, it is not compulsory to have a real time kernell in order
>  to start Jack. If well set up with a long latency (more than 60ms), it
>  can starts and works very well too.
>
>  Third point, the frames is the latest point to configure. I mean that
>  first, one has to set up the sample frequency he wants to work with
>  (44,1, 48, ...), then, try different period values (most of the time 2
>  or 3). And then, when RT is activated, it is possible to decrease the
>  frame value, so it will decrease the latency time. Basic sound cards
>  (like integrated chipsets) will not work well at latency below 20ms. And
>  some more professional sound chipset (M-Audio envy24, RME hdsp, etc...)
>  will start without matter at a period of 32 or 64, giving very low
>  latency around 2 or 3 ms at 48khz.
>
>  Depending the use, the latency has to be different. For example, if the
>  aim of the session is only to record a live performance, one can work
>  with a latency around 60ms to be sure of the quality of the result. If
>  the aim is to work on multi audio tracks with re-recording of musicians,
>  the lowest the latency is, the better it is for the musicians. And if
>  one wants to use midi, he will have to work around 8 ms or 10 ms to
>  avoid midi synchro problems.
>
>  So it means that people will have to test a bit, and configure depending
>  their sound card, and their need. And once it is well set up, it is
>  possible to save profiles for several uses and sound cards. Then, using
>  Patchage is not very difficult to explain.
>
>  A few month ago, I tried to write something on the ubuntu help wiki. The
>  problem is how to include on a ubuntu wiki page some screen capture ?
>  IMHO, it will be hard to write a good stuff for beginners on Qjackctl
>  without any screen capture. If you know how to do that, I would be glad
>  to help you.
>
>  Toine
>
>
>
>  hollunder at gmx.at a écrit :
>
>
> > Is the leader of the documentation team Murat Güneş? And if so, is he
>  > still not available?
>  >
>  > I feel the need to write a quick jack starter guide for new users,
>  > which covers the absolute basics to work with jack. But I need some
>  > advice, mainly because there are at least 3 articles that are similar,
>  > but don't really do the trick. Additionally, I never edited a wiki
>  > before.
>  >
>  > The guide, as I imagine it, in short words:
>  >
>  > 1. Make sure you have the rt-kernel
>  >
>  > 2. Make the appropriate settings in ubuntu studio controls
>  >
>  > 3. Make the necessary, stable settings in qjackctl, something like:
>  > frames 1024, periods3, rt
>  >
>  > 4. How to make basic connections using qjackctl, patchage
>  >
>  >
>  > Similar Articles:
>  > https://help.ubuntu.com/community/UbuntuStudio/GettingStarted
>  > https://help.ubuntu.com/community/HowToJACKConfiguration
>  > https://help.ubuntu.com/community/HowToQjackCtlConnections
>  >
>  >
>  > Advice appreciated.
>  >
>  > Best Regards,
>  >       Philipp
>  >
>  >

I also offer all of my help since this type of documentation is very needed.

Luis de Bethencourt

>
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Luis de Bethencourt Guimerá
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