Mine

pcm.!default {
        type dmix
        ipc_key 1024  # any unique value
        ipc_key_add_uid false
	ipc_perm 0660 
        slave {
                pcm "hw:0,0"
                period_time 0
                period_size 1024
                buffer_size 4096
                rate 44100
                format S32_LE

        }
}