JACK + ALSA = NOISY

[Eduardo Pellegrini]

Thanks Karoliina!
I'll try those when I get home.

By the way, I installed Ubuntu 32bit, but I have a Atlhon 64 3200+. Does the
64bit Ubuntu Studio work fine?

-- 
[]s
Eduardo C. Pellegrini


2007/9/3, Karoliina Salminen <karoliina.t.salminen at gmail.com>:
>
> Hi,
>
> On 9/3/07, Eduardo Pellegrini <haftsnation at gmail.com> wrote:
> > I've just installed Ubuntu Studio, and I was playing around with
> Hydrogen,
> > or anything that requires JACK, but everything that plays through JACK
> > sounds low, distorted and noisy.
>
> Check if you are getting xrun messages. If yes, your audio buffer is
> too short and you
> need to increase it and make the latency longer by increasing the
> buffers. You can do this
> with Qjackctl. Also put RT-mode to on on qjackctl, it helps even with
> the standard
> non-low-latency kernel. It also depends on which audio hardware you are
> using.
> With C-port the output is not so low, but I can't affect the output
> level, no matter what slider I adjust, it is always full. However, I
> can set the level on a analog mixer that comes after the C-port before
> the amplifier or I can adjust the input that comes to the C-port with
> another mixer and I also can of course adjust inside Ardour with the
> midi-mixer (Behringer BCF-2000).
>
> >
> > Anyway, I've only managed to boot through the regular kernel, the low
> > latency one does not boot X (nvidia).
> >
> > Is this a common problem?
>
> Obviously you don't have the nVidia binary driver compiled against
> that kernel, so it will not boot. With my GeForce 8800GTX card, I have
> needed to use the nVidia installer with even the stock kernel,
> otherwise it does not work. Another thing was that if my memory serves
> me right, the Ubuntu was unable to offer correct display mode by
> default for my monitor (30 inch Dell, 2560x1600 resolution), so I had
> to go to edit the xorg.conf manually and enter the 2560x1600
> -resolution there. I haven't dared to try the lowlatency kernel just
> yet because it will break the nVidia again.  You need to download the
> nvidia installer from here:
> http://www.nvidia.com/object/linux_display_ia32_100.14.11.html
> Anything that comes with Ubuntu by default breaks miserably, at least
> with my GeForce 8800GTX.
> With running the nVidia installer, it will start to work. I would like
> to advise you to download it before installing the low latency kernel.
> Then boot with the low latency kernel and when the X fails to start,
> go to command line and run the installer. You'll get X running if you
> are lucky.
> So you still need to hack a bit to do music with Linux, there is still
> a lots of work ahead before it is as easy as on for example Mac that
> works out of the box - you plug in your audio interface and it simply
> works, you start recording and don't even think about latency and
> other weird PC-related issues that make the life of the musician
> miserable...
>
> Best Regards,
> Karoliina Salminen
> (AMD64X2 4200+, GeForce 8800GTX, nVidia nforce motherboard  - running
> Ubuntu Studio (Feisty Fawn + some libraries from Gutsy), Ardour 2.05
> (from svn), ST-audio C-port DSP-2000 8 channel audio interface + 8
> port, 128 channel USB-midi interface + midi mixing console + a stack
> of hardware synthesizers, controllers, effects processors, keyboards
> etc. stuff. Everything works, including the monitor at 2560x1600
> resolution at 24 bits with full hardware accelerated OpenGL, however,
> only with the nVidia installer, not out of the box from
> Ubuntu-repository).
>
> --
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