[LAU] I really need help with jack

[Paul Davis]

ah, you appear to know this. so you've switched to the USB device, and the
problems are gone. pretty much points to the sort of device-specific issue
that david was referring to, i think.


On Sun, Jan 27, 2013 at 12:30 PM, Paul Davis <paul at linuxaudiosystems.com>wrote:

> are you really 100% sure that audacity is routing via JACK? you're running
> JACK on your *second* audio interface (the USB one)
>
>
> On Sun, Jan 27, 2013 at 12:26 PM, Bob van der Poel <bob at mellowood.ca>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?
>>
>> > 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.
>>
>> So, some progress on a cold winter's day. Wonderful.
>>
>> --
>> **** Listen to my CD at http://www.mellowood.ca/music/cedars ****
>> Bob van der Poel ** Wynndel, British Columbia, CANADA **
>> EMAIL: bob at mellowood.ca
>> WWW:   http://www.mellowood.ca
>> _______________________________________________
>> Linux-audio-user mailing list
>> Linux-audio-user at lists.linuxaudio.org
>> http://lists.linuxaudio.org/listinfo/linux-audio-user
>>
>
>
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