Combining two stereo devices on one card into one four-channel device (M-Audio FastTrack Pro)
16 Jul
2010
16 Jul
'10
11:22 p.m.
Hi,
I have an M-Audio FastTrack pro
(http://www.m-audio.com/products/en_us/FastTrackPro.html), which
presents its four playback channels as two devices (hw:1,0 + hw:1,1).
I want to combine the two devices into one, so I can use all channels
in Jack - but I'm struggling to get it working or even be sure that I
understand .asoundrc
Amongst other things, I have tried using the config from
http://www.mail-archive.com/alsa-user@lists.sourceforge.net/msg23839.html,
but it doesn't work:
$ aplay -vv -Dftpro:1,0 test.wav
ALSA lib conf.c:4612:(snd_config_expand) Load defaults error: File exists
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM ftpro:1,0
aplay: main:608: audio open error: File exists
Full alsa-info.sh output:
http://www.alsa-project.org/db/?f=0fc7694be834a5bcaba51317a0660de22911a02f
Another .asoundrc I've tried:
----8<----
pcm.fasttrackmulti {
type multi
slaves.a.pcm "hw:1,0";
slaves.a.channels 2
slaves.b.pcm "hw:1,1";
slaves.b.channels 2
# First 2 channels of first soundcard (playback)
bindings.0.slave a
bindings.0.channel 0
bindings.1.slave a
bindings.1.channel 1
# First 2 channels of second soundcard (playback)
bindings.2.slave b
bindings.2.channel 0
bindings.3.slave b
bindings.3.channel 1
}
ctl.fasttrackmulti {
type hw
card 2
}
----8<----
There is never any sign of the .asoundrc devices in aplay -l output.
Any ideas how I can get it working? Thanks in advance for any help!
Cheers,
Dave
--
http://www.witchesband.com/
16 Jul
16 Jul
11:28 p.m.
On 07/16/10 23:22, David Balch wrote:
Any ideas how I can get it working? Thanks in advance
for any help!
This all futile unless you can sync the word clock on both devices.
Happy soldering!
Flo
--
Machines can do the work, so people have time to think.
public key DA43FEF4 x-hkp://wwwkeys.eu.pgp.net
11:58 p.m.
New subject: Combining two stereo devices on one card into one four-channel device (M-Audio FastTrack Pro)
On Fri, Jul 16, 2010 at 11:27:57PM +0200, Florian Faber wrote:
On 07/16/10 23:22, David Balch wrote:
Are you certain the word clocks are separate, even tho both
devices appear on a single card?
Any ideas how I can get it working? Thanks in
advance for any help!
This all futile unless you can sync the word clock on both devices.
Happy soldering!
Flo
--
Joel Roth
17 Jul
17 Jul
12:22 a.m.
New subject: Combining two stereo devices on one card into one four-channel device (M-Audio FastTrack Pro)
On Fri, Jul 16, 2010 at 11:27:57PM +0200, Florian Faber wrote:
Maudio do/have done this on some devices for some reason. I haven't come
across any other manufacturers who do it. The clocks are synced but the
setup in alsa is a pita.
I have also noticed that previously tested and confirmed working
.asoundrc scripts don't work as expected. This started happening
sometime in the past couple of years. I'm not sure what has changed but
this stuff was sorted out several years ago and now it seems to be
broken again in that it is not just a case of copy and paste according
to the instructions that were painstakingly created all those years ago.
Either it's something to do with the location of the .asoundrc or it is
a change to the way the pcm.multi setup is now handled.
The result is that someone has to figure out what has changed and update
all the old scripts with the new details.
--
Patrick Shirkey
Boost Hardware Ltd
On 07/16/10 23:22, David Balch wrote:
Are you certain the word clocks are separate, even tho both
devices appear on a single card?
Any ideas how I can get it working? Thanks in
advance for any help!
This all futile unless you can sync the word clock on both devices.
Happy soldering!
19 Jul
19 Jul
1:46 p.m.
From: Patrick Shirkey<pshirkey at
boosthardware.com>
Feel free to ask more questions on this list
Thanks!
Well to start with you can create a device with a
specific name and then
see if it is found by jackd:
jackd -d alsa -dhw:mycard
pcm.mycard{
type hw
card 1
device 0
}
ctl.mycard{
type hw
card 1
}
Great, thanks.
Created a new .asoundrc with just that in [0], did `alsa-utils
restart`, and got this:
----8<----
$ pasuspender -- jackd -d alsa -dhw:mycard
jackd 0.118.0
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben
Hohn and others.
jackd 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
Memory locking is unlimited - this is dangerous. You should probably
alter the line:
@audio - memlock unlimited
in your /etc/limits.conf to read:
@audio - memlock 3043752
no message buffer overruns
JACK compiled with System V SHM support.
loading driver ..
SSE2 detected
creating alsa driver ...
hw:mycard|hw:mycard|1024|2|48000|0|0|nomon|swmeter|-|32bit
control open "hw:mycard" (No such device)
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to
capture-only mode
cannot load driver module alsa
----8<----
...which looks like a definitive not picking it up.
I'll file a bug in Launchpad, and see if that gets anywhere.
[0] To be accurate I changed it to card 0, as I'm on a different
Ubuntu machine. I'll test my main one later, at home.
Cheers,
Dave
--
http://www.witchesband.com/
5246
days inactive
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linux-audio-user@lists.linuxaudio.org
4 comments
4 participants
participants (4)
-
David Balch -
Florian Faber -
Joel Roth -
Patrick Shirkey