Re: [LAU] I really need help with jack

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To: linux-audio-user <linux-audio-user@...>
Date: Sunday, January 27, 2013 - 3:36 am

On 01/26/2013 02:04 PM, Bob van der Poel wrote:

I record regularly (and play back) using JACKD, Audacity and a UCA202.
I'm using Debian Sid WITHOUT PULSEAUDIO or an RT kernel.

I use QJackCTL to start JACK with these settings:
Server prefix: "/usr/bin/jackd -S --realtime
Realtime box: checked
Priority: DEFAULT
Frames/period: 1024
Sample Rate: 48000
Periods/buffer: 3
Dither: None
Audio: Duplex
Input device: hw:1
Output device: hw:1
Channels I/O: 2 (for both)
Latency I/O: Default (for both)

This gives me a latency of 64 msec. It works. When I try to go lower, I
start having problems.

Another note: The input/output device names might be different. If you
click on the ">" button beside the input/output devices in QJackCtl,
you'll see a list of audio devices. You want the one called "USB Audio
Codec", not the subdevice "USB Audio".

After I start JACK with QJackCtl, I start Audacity. I use Audacity
because it's much easier to use for simple recording than Ardour, and I
don't need the power of Ardour for what I do.

Settings in Audacity:
Set your project rate to 48000Hz.

Under Preferences > Device:
Select Host JACK Audio Connection Kit
Playback device: system
Recording device: system
Channels 2: (stereo).

I know you're recording only a single input, but I wonder if part of the
problem is trying to make the UCA202 operate simultaneously as stereo
(output) and mono (input). I've recorded vocal input using a mic hooked
into just one side of a stereo channel, then split the stereo track to
mono and deleted the empty channel track.

I use JACKD because it's the only reliable way I've found to make my
audio programs use the USB Audio. If I don't use JACK, all they want to
use is "Default". On my laptop, Default is the non-functional onboard
Intel Audio. (Laptop's 8 years old, it's been dropped a couple of times
and once landed on the corner containing the external audio controls -
what can I say?)

About monitoring your sax input. The UCA202 has a headphone out jack.
The switch beside the input channel side turns on or off its built-in
hardware monitoring. You might try turning hardware monitoring ON and
plugging your headphones into the headphone out jack instead of using
software monitoring. See if that meets your needs.

Hope that helps!

--
David
gnome@hawaii.rr.com
authenticity, honesty, community
http://clanjones.org/david/
http://dancing-treefrog.deviantart.com/
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Messages in current thread:
[LAU] I really need help with jack, Bob van der Poel, (Sat Jan 26, 10:36 pm)
Re: [LAU] I really need help with jack, Kaj Ailomaa, (Sat Jan 26, 11:27 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 12:04 am)
Re: [LAU] I really need help with jack, david, (Sun Jan 27, 3:36 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 5:26 pm)
Re: [LAU] I really need help with jack, david, (Mon Jan 28, 7:52 am)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Mon Jan 28, 9:58 am)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 5:30 pm)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 5:37 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 6:18 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Mon Jan 28, 12:43 am)
Re: [LAU] I really need help with jack, Folderol, (Sat Jan 26, 11:15 pm)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Sat Jan 26, 11:29 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sat Jan 26, 11:49 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sat Jan 26, 11:51 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sat Jan 26, 11:24 pm)
Re: [LAU] I really need help with jack, Paul Davis, (Sat Jan 26, 11:28 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sat Jan 26, 11:48 pm)
Re: [LAU] I really need help with jack, Len Ovens, (Sun Jan 27, 1:54 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 2:14 am)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 2:00 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 2:16 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 2:22 am)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 2:22 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 2:33 am)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 2:40 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 3:27 am)
Re: [LAU] I really need help with jack, Paul Davis, (Sun Jan 27, 2:22 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 2:31 am)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Sat Jan 26, 11:58 pm)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 12:06 am)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Sun Jan 27, 12:13 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 12:15 am)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Sun Jan 27, 12:29 am)
Re: [LAU] I really need help with jack, Bob van der Poel, (Sun Jan 27, 12:37 am)
Re: [LAU] I really need help with jack, Ralf Mardorf, (Sun Jan 27, 1:09 am)