Something

VIA8233.pcm.surround51.0 {
        @args [ CARD ]
        @args.CARD {
                type string
        }
        type hooks
        slave.pcm {
                type hw
                card $CARD
                device 1
                channels 6
        }
        hooks.0 {
                type ctl_elems
                hook_args [
                        {
                                name "Channel Mode"
                                device 0
                                preserve true
                                value "6ch"
                                lock true
                                optional true
                        }
                        # for old drivers
                        {
                                name "Line-In As Surround"
                                preserve true
                                value true
                                optional true
                        }
                        {
                                name "Mic As Center/LFE"
                                preserve true
                                value true
                                optional true
                        }
                        {
                                name "Surround Down Mix"
                                device 0
                                preserve true
                                value off
                                lock true
                                optional true
                        }
                        {
                                name "Center/LFE Down Mix"
                                device 0
                                preserve true
                                value off
                                lock true
                                optional true
                        }
                ]
        }
}