asound.conf for multiple cards one device

[Fergus Reid <fergusr@solid-state-logic.com>]

Hi, I'm trying to configure asound.conf to support "two cards as one" 
(but with 3, 8 channel cards!) as suggested in the .asoundrc doc. When I 
try to aplay the new device however I get:

"ALSA lib pcm_multi.c:928:(_snd_pcm_multi_open) Invalid or missing 
schannel for channel 0
aplay: main:462: audio open error: Invalid argument"

I'm using three terratec ews88mt cards and my asound.conf looks like this:



pcm_slave.ssl8_s {
    pcm ssl8_0
}
pcm.ssl8_0 {
    type hw
    card 0
}
ctl.ssl8_0 {
    type hw
    card 0
}
pcm.ssl8_1 {
    type hw
    card 1
}
ctl.ssl8_1 {
    type hw
    card 1
}
pcm.ssl8_2 {
    type hw
    card 2
}
ctl.ssl8_2 {
    type hw
    card 2
}
ctl.ssl_24 {
    type hw
    card 0
}

pcm.ssl_24 {
    type multi;
    slaves.a.pcm ssl8_0;
    slaves.a.channels 8;
    slaves.b.pcm ssl8_1;
    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 8;
    bindings.1.slave b;
    bindings.1.channel 9;
    bindings.2.slave b;
    bindings.2.channel 10;
    bindings.3.slave b;
    bindings.3.channel 11;
    bindings.4.slave b;
    bindings.4.channel 12;
    bindings.5.slave b;
    bindings.5.channel 13;
    bindings.6.slave b;
    bindings.6.channel 14;
    bindings.7.slave b;
    bindings.7.channel 15;

    bindings.0.slave c;
    bindings.0.channel 16;
    bindings.1.slave c;
    bindings.1.channel 17;
    bindings.2.slave c;
    bindings.2.channel 18;
    bindings.3.slave c;
    bindings.3.channel 19;
    bindings.4.slave c;
    bindings.4.channel 20;
    bindings.5.slave c;
    bindings.5.channel 21;
    bindings.6.slave c;
    bindings.6.channel 22;
    bindings.7.slave c;
    bindings.7.channel 23;
}

pcm.ttable {
    type route;
    slave.pcm "ssl_24";
    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;
    ttable.16.16 1;
    ttable.17.17 1;
    ttable.18.18 1;
    ttable.19.19 1;
    ttable.20.20 1;
    ttable.21.21 1;
    ttable.22.22 1;
    ttable.23.23 1;
}
# see above.
ctl.ttable {
        type hw;
        card 0;
}

Incidentally I can't see what the first pcm_slave entry is for. Can I 
get this to work somehow?
Thanks
Fergus




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