8 Dec
2004
8 Dec
'04
5:02 p.m.
Hi all,
I'm not really new to either linux (4 -5 years) or linux audio (2-3
years) BUT I am new to getting more than one sound card to function at
the same time. I'm trying to get a linux based sound system (recording
only) up and running for our church. They currently have an 8 channel
mixer/amp and I would like to record8 analog channels in real-time. It
seems everything I have tried doen't work.
Here's the situation: I have alsa v 1.07 drivers, etc installed on a
2.4.25 kernel with the low-latency patch I have downloaded Jack v 0.99
and installed it. In conjunction with Ardour I can get either, BUT NOT
BOTH sound cards to record/play.
Any ideas? I have even explored the 8 channel sound cards but I just
know the church can't afford $500.
Thanks
Harold Norris
8 Dec
8 Dec
5:30 p.m.
Hi,
On Wednesday 08 December 2004 22:04, Pam & Harold Norris wrote:
I'm not really new to either linux (4 -5 years) or
linux audio (2-3
years) BUT I am new to getting more than one sound card to function at
the same time. I'm trying to get a linux based sound system (recording
only) up and running for our church. They currently have an 8 channel
mixer/amp and I would like to record8 analog channels in real-time. It
seems everything I have tried doen't work.
Here's the situation: I have alsa v 1.07 drivers, etc installed on a
2.4.25 kernel with the low-latency patch I have downloaded Jack v 0.99
and installed it. In conjunction with Ardour I can get either, BUT NOT
BOTH sound cards to record/play.
Short summary from the various mails on this list and from alsa-project.org:
It is possible via an .asoundrc but you wont get it to work with jack without
xruns. xruns are when one soundcard needs its new data (for playback) before
the other card. It happens because your soundcards won't run with _exactly_
the same frequency altough all clame to to 44.1kHz/48kHz.
There was a thread here (or on linux-audio-developer@?) where one disconnected
the quartzes from the second and third soundcard and connected them with the
one from the first soundcard. Another approach is syncing the cards via an
external digital sound signal (not timecode)...
Any ideas? I have even explored the 8 channel sound
cards but I just
know the church can't afford $500.
I know your poblem, I just ordered for 400EUR for our church and had to ask
the elder for permission...
God bless you,
Arnold
--
There is a theory which states that if ever anyone discovers exactly what the
Universe is for and why it is here, it will instantly disappear and be
replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened.
-- Douglas Adams, The Restaurant at the End of the Universe
6:08 p.m.
Arnold Krille wrote:
Hi,
On Wednesday 08 December 2004 22:04, Pam & Harold Norris wrote:
Problem here is any card that has this capability is at least $150 US
last time I checked and I bought by Delta 1010LT on Ebay used for $180.00.
This is not relly feasible in terms of cheap solutions for good quality
recordings. Spend the money available on a cheap mixer and pre mix it
down to stereo. God doesn't mind premixed recordings last time I asked
him. :)
R~
I'm not really new to either linux (4 -5
years) or linux audio (2-3
years) BUT I am new to getting more than one sound card to function at
the same time. I'm trying to get a linux based sound system (recording
only) up and running for our church. They currently have an 8 channel
mixer/amp and I would like to record8 analog channels in real-time. It
seems everything I have tried doen't work.
Here's the situation: I have alsa v 1.07 drivers, etc installed on a
2.4.25 kernel with the low-latency patch I have downloaded Jack v 0.99
and installed it. In conjunction with Ardour I can get either, BUT NOT
BOTH sound cards to record/play.
Short summary from the various mails on this list and from alsa-project.org:
It is possible via an .asoundrc but you wont get it to work with jack without
xruns. xruns are when one soundcard needs its new data (for playback) before
the other card. It happens because your soundcards won't run with _exactly_
the same frequency altough all clame to to 44.1kHz/48kHz.
There was a thread here (or on linux-audio-developer@?) where one disconnected
the quartzes from the second and third soundcard and connected them with the
one from the first soundcard. Another approach is syncing the cards via an
external digital sound signal (not timecode)...
Any ideas? I have even explored the 8 channel
sound cards but I just
know the church can't afford $500.
I know your poblem, I just ordered for 400EUR for our church and had to ask
the elder for permission...
God bless you,
Arnold
6:14 p.m.
Hi,
It is possible via an .asoundrc but you wont get it to
work
with jack without xruns. xruns are when one soundcard needs
its new data (for playback) before the other card. It
happens because your soundcards won't run with _exactly_
the same frequency altough all clame to to 44.1kHz/48kHz.
short question: Is this also the case, if I have three cards
but only one is used by jack?
I also get xruns with my USB card. It's the third card,
because I have an AC 97 and an USB2MIDI device.
When I try to run jack, it works, but I get some (but not too
much) xruns. Should I disable the AC 97 card?
Thanks & best regards
ce
6:51 p.m.
On Wed, 8 Dec 2004 23:15:10 +0100, Christoph Eckert
<mchristoph.eckert(a)t-online.de> wrote:
Hi,
No. This is not a problem. I have 2 or 3 cards or chips in most of my
machines. Jack just sync's to one and the others do not matter.
It is possible via an .asoundrc but you wont get
it to work
with jack without xruns. xruns are when one soundcard needs
its new data (for playback) before the other card. It
happens because your soundcards won't run with _exactly_
the same frequency altough all clame to to 44.1kHz/48kHz.
short question: Is this also the case, if I have three cards
but only one is used by jack?
I also get xruns with my USB card. It's the third card,
because I have an AC 97 and an USB2MIDI device.
When I try to run jack, it works, but I get some (but not too
much) xruns. Should I disable the AC 97 card?
While I cannot speak too much about USB audio as I don't use it I was
able to help one individual the other day get rid of his xrun
problems. The newer kernels, 2.6.9'ish, along with patches for low
latency, allow you to set the interrupt processing of the sound card
to be non-threaded and therefore of higher priority in the machine.
This will give you a definiate leg up on getting rid of xruns whether
using USB as he was or PCI solutions as I do.
Good luck,
Mark
Thanks & best regards
ce
9:23 p.m.
On Wed, 2004-12-08 at 14:51 -0800, Mark Knecht wrote:
No. This is not a problem. I have 2 or 3 cards or
chips in most of my
machines. Jack just sync's to one and the others do not matter.
Recently support for multiple servers was added to JACK CVS. So, you
could theoretically run as many jackds as you have soundcards, and
record two channels with each. Of course the resulting recordings will
not be in perfect sync but you could always stretch it a bit afterwards.
This is a bleeding edge feature so don't expect it to work perfectly.
Actually it won't work at all now because no existing JACK client
supports it. But there should be some soon.
Lee
6:57 p.m.
On Wednesday 08 December 2004 23:15, Christoph Eckert wrote:
Short answer: No. ;-)
Long answer: It happens if you use them at the same time with the same process
(your jackd).
You can even let jackd use one soundcard for studio mastering/recording and
use a second card to listen to your own music...
It is possible
via an .asoundrc but you wont get it to work
with jack without xruns. xruns are when one soundcard needs
its new data (for playback) before the other card. It
happens because your soundcards won't run with _exactly_
the same frequency altough all clame to to 44.1kHz/48kHz.
short question: Is this
also the case, if I have three cards
but only one is used by jack? I also get xruns with my USB card. It's the third
card,
because I have an AC 97 and an USB2MIDI device.
I have three cards too. Getting xruns isn't only an effect of using two
asynchronous soundcards...
When I try to run jack, it works, but I get some (but
not too
much) xruns. Should I disable the AC 97 card?
Do as you like, I was happy to realize my on-board does 3 stereo line outs
accessible from jackd.
If you get xruns, try using a smaller windowmanager and stop all programs you
don't need for your music. If that isn't enough, stop making music as
well. :-P
Or use bigger buffers for jackd.
Arnold
--
There is a theory which states that if ever anyone discovers exactly what the
Universe is for and why it is here, it will instantly disappear and be
replaced by something even more bizarre and inexplicable.
There is another theory which states that this has already happened.
-- Douglas Adams, The Restaurant at the End of the Universe
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days inactive
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days old
linux-audio-user@lists.linuxaudio.org
6 comments
6 participants
participants (6)
-
Arnold Krille -
Lee Revell -
Mark Knecht -
mchristoph.eckert＠t-online.de -
Pam & Harold Norris -
Russell Hanaghan