UAC3_PROCESS_UP_DOWNMIX 2303 sound/usb/mixer.c 	{ UAC3_PROCESS_UP_DOWNMIX, "Up Down", uac3_updown_proc_info },
UAC3_PROCESS_UP_DOWNMIX  146 sound/usb/validate.c 		case UAC3_PROCESS_UP_DOWNMIX: