Bill,
These cards have word clocks that are synced with a bnc cable, so drift isn't an issue for me. But I appreciate the suggestion.
Chris
From: Bill Unruh <unruh@xxxxxxxxxxxxxx>
Sent: Wednesday, February 23, 2022 22:21
To: Christopher Brown
Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [Alsa-user] Playback using multiple devices
Sent: Wednesday, February 23, 2022 22:21
To: Christopher Brown
Cc: alsa-user@xxxxxxxxxxxxxxxxxxxxx
Subject: Re: [Alsa-user] Playback using multiple devices
One p0roblem with two sound cards is that the two frequencies may be out from
each other. Unless they are driven by the same crystal, if the two frequencies
are different by .01%, by a 1000 sec ( 15 min) they will be out by 1/10 of a
sec. Ie, one or the other will be producing sound 1/10 of a second before the
other. Highly audible.
William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
On Thu, 24 Feb 2022, Christopher Brown wrote:
> [CAUTION: Non-UBC Email] Hi Again,
>
> So I guess I am looking for some closure on this. Can someone explain what the situation is? Does multi-card
> no longer work? It clearly did at some point given the prevalence of sample rc files around the web, but is
> this not the case anymore? I need a multi-card setup for my work, and the ffado firewire drivers for jack are
> troublesome at best for me on Manjaro. Any insights, even if it is that it just doesn't work, would be
> appreciated.
>
> Thanks,
> Chris
>
>
> Christopher Brown wrote:
>
>
> Hi List,
>
> I have an updated Manjaro system and two RME Fireface 800 8-output-channel devices, both of which work
> well. I would like to create a 16-channel virtual device for playback, but I am having quite a bit of
> difficulty. I have tried many things, but the closest I have come to success seems to be with the
> following .asoundrc, which allows me to use either ff800_1 or ff800_2 to playback sound with portaudio,
> but ff800x2 (the intended 16-channel virtual device) does not show up and thus is not accessible. This
> config file was adapted with minimal edits from post #19 at
> https://bbs.archlinux.org/viewtopic.php?id=109370 which claims to be a working example (although as
> posted it duplicated 2 audio channels out to 4 hardware channels across 2 devices).
>
> Any insights into what I am doing wrong are greatly appreciated.
>
> ## Begin .asoundrc
> pcm.!default plug:ff800x2
>
> ctl.!default {
> type hw
> card 0
> }
>
> pcm.ff800x2 {
> type route;
> slave.pcm {
> type multi;
> slaves.a.pcm "ff800_1";
> slaves.b.pcm "ff800_2";
> slaves.a.channels 8;
> slaves.b.channels 8;
>
> bindings.0.slave a;
> bindings.0.channel 0;
> bindings.1.slave a;
> bindings.1.channel 1;
> bindings.2.slave a;
> bindings.2.channel 2;
> bindings.3.slave a;
> bindings.3.channel 3;
> bindings.4.slave a;
> bindings.4.channel 4;
> bindings.5.slave a;
> bindings.5.channel 5;
> bindings.6.slave a;
> bindings.6.channel 6;
> bindings.7.slave a;
> bindings.7.channel 7;
>
> bindings.0.slave b;
> bindings.0.channel 0;
> bindings.1.slave b;
> bindings.1.channel 1;
> bindings.2.slave b;
> bindings.2.channel 2;
> bindings.3.slave b;
> bindings.3.channel 3;
> bindings.4.slave b;
> bindings.4.channel 4;
> bindings.5.slave b;
> bindings.5.channel 5;
> bindings.6.slave b;
> bindings.6.channel 6;
> bindings.7.slave b;
> bindings.7.channel 7;
>
> }
>
> ttable.0.0 1;
> ttable.1.1 1;
> ttable.2.2 1;
> ttable.3.3 1;
> ttable.4.4 1;
> ttable.5.5 1;
> ttable.6.6 1;
> ttable.7.7 1;
> ttable.8.8 1;
> ttable.9.9 1;
> ttable.10.10 1;
> ttable.11.11 1;
> ttable.12.12 1;
> ttable.13.13 1;
> ttable.14.14 1;
> ttable.15.15 1;
> }
>
> ctl.ff800x2 {
> type hw;
> card 0;
> }
>
> pcm.ff800_1 {
> type dmix
> ipc_key 1024
> slave {
> pcm "hw:0"
> period_time 0
> period_size 1024
> buffer_size 16384
> # buffer_time 0
> # periods 128
> rate 44100
> channels 8
> }
> bindings {
> 0 0
> 1 1
> 2 2
> 3 3
> 4 4
> 5 5
> 6 6
> 7 7
> }
> }
>
> pcm.ff800_2 {
> type dmix
> ipc_key 2048
> slave {
> pcm "hw:1"
> period_time 0
> period_size 1024
> buffer_size 65536
> # buffer_time 0
> # periods 128
> rate 44100
> channels 8
> }
> bindings {
> 0 0
> 1 1
> 2 2
> 3 3
> 4 4
> 5 5
> 6 6
> 7 7
> }
> }
>
> ctl.ff800_1 {
> type hw
> card 0
> }
>
> ctl.ff800_2 {
> type hw
> card 1
> }
> ## End .asoundrc
>
>
>
each other. Unless they are driven by the same crystal, if the two frequencies
are different by .01%, by a 1000 sec ( 15 min) they will be out by 1/10 of a
sec. Ie, one or the other will be producing sound 1/10 of a second before the
other. Highly audible.
William G. Unruh __| Canadian Institute for|____ Tel: +1(604)822-3273
Physics&Astronomy _|___ Advanced Research _|____ Fax: +1(604)822-5324
UBC, Vancouver,BC _|_ Program in Cosmology |____ unruh@xxxxxxxxxxxxxx
Canada V6T 1Z1 ____|____ and Gravity ______|_ www.theory.physics.ubc.ca/
On Thu, 24 Feb 2022, Christopher Brown wrote:
> [CAUTION: Non-UBC Email] Hi Again,
>
> So I guess I am looking for some closure on this. Can someone explain what the situation is? Does multi-card
> no longer work? It clearly did at some point given the prevalence of sample rc files around the web, but is
> this not the case anymore? I need a multi-card setup for my work, and the ffado firewire drivers for jack are
> troublesome at best for me on Manjaro. Any insights, even if it is that it just doesn't work, would be
> appreciated.
>
> Thanks,
> Chris
>
>
> Christopher Brown wrote:
>
>
> Hi List,
>
> I have an updated Manjaro system and two RME Fireface 800 8-output-channel devices, both of which work
> well. I would like to create a 16-channel virtual device for playback, but I am having quite a bit of
> difficulty. I have tried many things, but the closest I have come to success seems to be with the
> following .asoundrc, which allows me to use either ff800_1 or ff800_2 to playback sound with portaudio,
> but ff800x2 (the intended 16-channel virtual device) does not show up and thus is not accessible. This
> config file was adapted with minimal edits from post #19 at
> https://bbs.archlinux.org/viewtopic.php?id=109370 which claims to be a working example (although as
> posted it duplicated 2 audio channels out to 4 hardware channels across 2 devices).
>
> Any insights into what I am doing wrong are greatly appreciated.
>
> ## Begin .asoundrc
> pcm.!default plug:ff800x2
>
> ctl.!default {
> type hw
> card 0
> }
>
> pcm.ff800x2 {
> type route;
> slave.pcm {
> type multi;
> slaves.a.pcm "ff800_1";
> slaves.b.pcm "ff800_2";
> slaves.a.channels 8;
> slaves.b.channels 8;
>
> bindings.0.slave a;
> bindings.0.channel 0;
> bindings.1.slave a;
> bindings.1.channel 1;
> bindings.2.slave a;
> bindings.2.channel 2;
> bindings.3.slave a;
> bindings.3.channel 3;
> bindings.4.slave a;
> bindings.4.channel 4;
> bindings.5.slave a;
> bindings.5.channel 5;
> bindings.6.slave a;
> bindings.6.channel 6;
> bindings.7.slave a;
> bindings.7.channel 7;
>
> bindings.0.slave b;
> bindings.0.channel 0;
> bindings.1.slave b;
> bindings.1.channel 1;
> bindings.2.slave b;
> bindings.2.channel 2;
> bindings.3.slave b;
> bindings.3.channel 3;
> bindings.4.slave b;
> bindings.4.channel 4;
> bindings.5.slave b;
> bindings.5.channel 5;
> bindings.6.slave b;
> bindings.6.channel 6;
> bindings.7.slave b;
> bindings.7.channel 7;
>
> }
>
> ttable.0.0 1;
> ttable.1.1 1;
> ttable.2.2 1;
> ttable.3.3 1;
> ttable.4.4 1;
> ttable.5.5 1;
> ttable.6.6 1;
> ttable.7.7 1;
> ttable.8.8 1;
> ttable.9.9 1;
> ttable.10.10 1;
> ttable.11.11 1;
> ttable.12.12 1;
> ttable.13.13 1;
> ttable.14.14 1;
> ttable.15.15 1;
> }
>
> ctl.ff800x2 {
> type hw;
> card 0;
> }
>
> pcm.ff800_1 {
> type dmix
> ipc_key 1024
> slave {
> pcm "hw:0"
> period_time 0
> period_size 1024
> buffer_size 16384
> # buffer_time 0
> # periods 128
> rate 44100
> channels 8
> }
> bindings {
> 0 0
> 1 1
> 2 2
> 3 3
> 4 4
> 5 5
> 6 6
> 7 7
> }
> }
>
> pcm.ff800_2 {
> type dmix
> ipc_key 2048
> slave {
> pcm "hw:1"
> period_time 0
> period_size 1024
> buffer_size 65536
> # buffer_time 0
> # periods 128
> rate 44100
> channels 8
> }
> bindings {
> 0 0
> 1 1
> 2 2
> 3 3
> 4 4
> 5 5
> 6 6
> 7 7
> }
> }
>
> ctl.ff800_1 {
> type hw
> card 0
> }
>
> ctl.ff800_2 {
> type hw
> card 1
> }
> ## End .asoundrc
>
>
>
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