On 01/27/2013 07:26 AM, Bob van der Poel wrote:
Hey, I have some success to report !!!!
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)
Okay, this is a start. I tried it and it sort of works. Problem is
that on playback I get motorboat sound. Not what we want. I also get a
bunch of dbus errors while jack is trying to start.
So, decided to give it one last try :)
I have pulse running, etc. From a command line:
pasuspender -- jackd -d alsa -d hw:1
jackdmp 1.9.8
Copyright 2001-2005 Paul Davis and others.
Copyright 2004-2011 Grame.
jackdmp comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details
JACK server starting in realtime mode with priority 10
Cannot lock down 82241434 byte memory area (Cannot allocate memory)
control device hw:1
control device hw:1
audio_reservation_init
Acquire audio card Audio1
creating alsa driver ... hw:1|hw:1|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:1
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 16bit little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 16bit little-endian
ALSA: use 2 periods for playback
Start up audacity ... and it works! Using audacity setting Overdub On
I get the background playing out of the usb headphone jack. And
recording seems to be fine. Just spoke some <this is a test> stuff
into the mic, but that seems to work. I'll try my sax later.
I have no idea why the qjackctl is barfing. Versions?
I have QJackCtl 0.3.9.
Settings in Audacity:
Set your project rate to 48000Hz.
Does this make a difference? I have jack running now at 48000 and
audacity at 44100 and it sounds fine.
I just prefer to use the highest quality sample rate it supports.
Removes one resampling step from the audio processing chain. But, really
- how much music is distributed on CD these days, vs electronic download?
So, some progress on a cold winter's day. Wonderful.
Hurrah!
--
David
gnome@xxxxxxxxxxxxx
authenticity, honesty, community
http://clanjones.org/david/
http://dancing-treefrog.deviantart.com/
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