Re: [xwax-devel] xwax and jack

[Matthieu C. <mc...@fr...>]

Thanks for your inputs Charles and Matt.
Nothing helps unfortunately.

I can run jack with RT capabilities (+ frames/period = 64, sample/rate = 
44100, periods/buffer = 2) and xwax without any xrun but I still have 
the same issue.
Maybe xwax is not running RT... even if I followed the instructions. Is 
there a way to check?
Since everything is fine with alsa, do you have any idea in which 
direction I should investigate?
Thanks again.


On 12/16/2010 09:57 AM, Intamixx Music Company wrote:
> Sorry have to be quick...!
> I am using RHEL5 with alsa-lib-1.0.17-1.el5.
> I am using custom RT kernel 2.6.28.
> I use the following commands with jack server
> /usr/bin/jackd -R -dalsa -dhw:0 -r44100 -p128 -n2 -S -Xseq
> I am using asus xonar d1 and intel onboard sound card.  I use alsa-in 
> and alsa-out jack utils to use both soundcards
> Using xwax with jack-rack I get amazing sounding real time effects 
> when scratching and playing normally.  The response time is super fast.
> Let me know if you need to know any other config I have.
> thanks,
> matt
>
>
> > From: ch...@do...
> > To: xwa...@li...
> > Date: Tue, 14 Dec 2010 15:57:27 -0800
> > Subject: Re: [xwax-devel] xwax and jack
> >
> > Hi Matthieu,
> >
> > My experience has been that tuning Jack audio is much more difficult
> > than ALSA audio. It's taken me several tries to find the right settings
> > for my Firewire Stanton Scratchamp 2.
> >
> > Most importantly, do you have your system setup so that your user can
> > run xwax and jack in realtime? (See: http://jackaudio.org/faq ,
> > http://help.ubuntu.com/community/UbuntuStudioPreparation#Real-Time
> > Support , http://help.ubuntu.com/community/FireWire ) . It's very
> > possible that xwax and/or jack are not running at a high enough
> > priority.
> >
> > HTH,
> >
> > Charles
> >
> >
> > On Wed, 2010-12-15 at 00:39 +0100, Matthieu Caron wrote:
> > > Hi,
> > > You can find two examples, one recorded with ALSA 
> (export_alsa.ogg) and
> > > one with JACK (export_jack.ogg) at http://mcaron.free.fr/xwax/. I 
> hope
> > > it can help.
> > > Maybe my settings in JACK are not correct?
> > > I run under Fedora (first under fedora12 with a RT kernel from 
> CCRMA and
> > > now under fedora 14 with the normal kernel - I have this problem in
> > > both) and have an audiophile 24/96.
> > >
> > > The second issue is solved with stereo 44100Hz files. Thank you.
> > >
> > >
> > > Le 12/12/2010 12:52, Mark Hills a écrit :
> > > > On Wed, 8 Dec 2010, Matthieu Caron wrote:
> > > >
> > > >> Hi all,
> > > >> I am using xwax to scratch and I get very good results with 
> alsa. I now
> > > >> need to use it with jack... But with jack scratches sound 
> terrible...
> > > >> I configured jack to have very small latency (fx 2ms (or even less)
> > > >> according to qjackctl) but it doesn't help....
> > > >> Do you have any idea?
> > > > There's nothing immediately different about the JACK 
> implementation that
> > > > would make it sound worse, can you describe the sound you are 
> hearing? Or
> > > > perhaps even post a recording online and include a link.
> > > >
> > > >> Another issue:
> > > >> when playing flac or ogg files (created with ardour), xwax read the
> > > >> files too quickly (maybe twice the normal speed...)
> > > > It sounds like the file is not stereo 44100Hz. In some cases the 
> import
> > > > script will do the conversion, in some cases it won't. Perhaps a
> > > > workaround is to remove the FLAC and Ogg entries from the import 
> script,
> > > > and always fallback to ffmpeg or sox.
> > > >
> > >
> > >
> > > 
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> >
> >
> >
> > 
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>
> ------------------------------------------------------------------------------
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> to connect the dots, take your collaborative environment
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