On 05/07/2011 05:52 PM, KarlHungus wrote:
can you tell me what is listed when you click on ">" in qjackctl at the
right of 'interface' ?
hw:1 GIGAPort HD
hw:1,0 USB Audio

mmh, maybe it's splitted in 2x4 channels ?

sorry I'm not an expert with ALSA but maybe it's worth trying this attached file, save it as .asoundrc in your home directory and see (after restarting jack) if you get 4 channels out ?

cheers,
_y
pcm_slave.DJ0 { pcm "hw:1" } # assuming your card is on "hw:1"

pcm.usb {
        type plug
        slave DJ0
}

ctl.usb {
        type plug
        slave DJ0
}


pcm.multi {
        type multi;

        slaves.a.pcm "hw:1";
        slaves.a.channels 4;

        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;
}

ctl.multi {
        type hw;
        card 1;
}

pcm.ttable {
        type route;
        slave.pcm "multi";

        ttable.0.0 1;
        ttable.1.1 1;

        ttable.2.2 1;
        ttable.3.3 1;
}

ctl.ttable {
        type hw;
        card 1;
}
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