[PlanetCCRMA] USB (& firewire) interface

[Sean Beeson]

Simon,

This is my

# create a virtual four-channel device with two sound devices:
# This is in fact two interleaved stereo streams in
# different memory locations, so JACK will complain that it
# cannot get mmap-based access. see below.

pcm.multi {
        type multi;
        slaves.a.pcm "hw:4,0";
        slaves.a.channels 2;
        slaves.b.pcm "hw:4,1";
        slaves.b.channels 2;
        bindings.0.slave a;
        bindings.0.channel 0;
        bindings.1.slave a;
        bindings.1.channel 1;
        bindings.2.slave b;
        bindings.2.channel 0;
        bindings.3.slave b;
        bindings.3.channel 1;
}

# JACK will be unhappy if there is no mixer to talk to, so we set
# this to card 0. This could be any device but 0 is easy.

ctl.multi {
        type hw;
        card 4;
}

# This creates a 4 channel interleaved pcm stream based on
# the multi device. JACK will work with this one.

pcm.ttable {
        type route;
        slave.pcm "multi";
        slave.channels 4;
        ttable.0.0 1;
        ttable.1.1 1;

}
# see above.
ctl.ttable {
        type hw;
        card 4;
}


At first I had to make a etc/modprobe.d/somename file to force my card
to have the same place on each bootup. I have a M-Audio FTP and used
these settings in it:
http://alsa.opensrc.org/index.php/M-Audio_FastTrack_Pro You'll  have
to figure out the right thing for your card.

I had to read all the following to figure it out.

http://alsa.opensrc.org/index.php/.asoundrc
http://alsa.opensrc.org/index.php/TwoCardsAsOne
http://alsa.opensrc.org/index.php/MultipleCards
http://alsa.opensrc.org/index.php/MultipleUSBAudioDevices

Alsa sees it, Jack still is not seeing it. Someone in another thread
has given me a link to check about that.

-Sean