Mine

pcm.!default {
        type dmix 
        ipc_key 1024
        ipc_key_add_uid false
        ipc_perm 0660
        slave {
                pcm "hw:0,0"
                rate 48000
                channels 2
                period_time 0
                period_size 1024
                buffer_time 0
                buffer_size 8192
        }
}