Mine

pcm.!default {
    type plug
    slave.pcm "asymed"
}
pcm.dsp0 {
    type plug
    slave.pcm "asymed"
}
pcm.dmixed {
    type dmix
    ipc_key 1024
    slave {
        pcm "hw:0,0"
        #we dont need those atm 
        #period_time 0
        #period_size 1024
        #buffer_size 8192
        #periods 128
        #rate 44100
     }
     bindings {
        0 0
        1 1
     }
}
#microphone dmix plugin dsnoop
pcm.dsnooped {
   type dsnoop
   ipc_key 1025
   slave {
     pcm "hw:0,0"
   }
}
#combine dmix and dsnoop to one device
pcm.asymed {
       type asym
       playback.pcm "dmixed"
       capture.pcm "dsnooped"
}
ctl.mixer0 {
    type hw
    card 0
}