ewomer

pcm.hda-intel-hw {
        type hw
        card 0
}

pcm.hda-intel {
        type dmix
        ipc_key 1234
        ipc_perm 0660
        slave {
                pcm "hw:0"
                channels 2
                period_size 1024
                buffer_size 4096
                rate 44100
                period_time 0
        }
        bindings {
                0 0
                1 1
        }
}

ctl.hda-intel-hw {
        type hw
        card 0
}

pcm.usb-audio-hw {
        type hw
        card 1
}

pcm.usb-audio {
        type dmix
        ipc_key 4321
        ipc_perm 0660
        slave {
                pcm "hw:1,0"
                channels 2
                period_size 1024
                buffer_size 4096
                rate 44100
                period_time 0
        }
        bindings {
                0 0
                1 1
        }
}

ctl.usb-audio-hw {
        type hw
        card 1
}