Re: output to from 2 sound cards at once

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Hi,
I think this can be done by the copy plugin.
But not figured out how to do to use it.

http://www.alsa-project.org/alsa-doc/alsa-lib/pcm_plugins.html

Plugin: copy
This plugin copies samples from master copy PCM to given slave PCM.
The channel count, format and rate must match for both of them.

pcm.name {
        type copy               # Copy PCM
        slave STR               # Slave name
        # or
        slave {                 # Slave definition
                pcm STR         # Slave PCM name
                # or
                pcm { }         # Slave PCM definition
        }
}


How to define the master? Is not the default.
One of .asoundrc tested configuration.
pcm.copy {
    type copy
    slave {
       pcm card1
    }
}
pcm.card0 {
    type hw
    card 0
}
pcm.card1 {
    type hw
    card 1
}

speaker-test -c 2 -D copy
Play only on card1.



-
Paulino

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