How to connect a ALSA output to multiple Jack inputs through asound.conf

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I have configured Alsa's asound.conf like said in the Alsa wiki to work 
with Jack-Audio and it works fine but i want to connect an alsa output 
to multiple jack inputs, how to do?

my asound.conf:

pcm.!default {
     type plug
     slave { pcm "jack" }
}

pcm.jack {
     type jack
     playback_ports {
         0 alsa_pcm:playback_1
#       0 alsa_pcm:playback_7
         1 alsa_pcm:playback_2
#       2 alsa_pcm:playback_3
#       3 alsa_pcm:playback_4
#       4 alsa_pcm:playback_5
#       5 alsa_pcm:playback_6
#       6 alsa_pcm:playback_7
#       7 alsa_pcm:playback_8
     }
     capture_ports {
         0 alsa_pcm:capture_1
         1 alsa_pcm:capture_2
     }
}

ctl.mixer0 {
     type hw
     card 0
}

PS: it works on the contrary:

if i write:

        0 alsa_pcm:playback_2
        1 alsa_pcm:playback_2

it works

but not:

        0 alsa_pcm:playback_1
        0 alsa_pcm:playback_2

in this case it join the 0 channel with the playback 2...

Thanks,

Stefano

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